What to do, what words to return the guy? It all depends on how the separation went.
The best option is when people disperse peacefully enough. If the girl herself threw the guy - then the task can, as it becomes more complicated, and become more easy. The fact is that a man can have strong feelings, and he just will not be able to resist them. But, on the other hand, he also may have anger and resentment in his soul, because of which he will not want to go to contact and reconciliation.
What words return the guy? Of course, true. Do not blame the soul and try to justify yourself. If you do this, most likely the young man decides that you want to deceive him again, play with him, and then throw him away like a broken doll. This will cause his unwillingness to renew any relationship. Therefore, you will have to confess honestly to the young man in all your sins. It's worth forgetting about pride. It is necessary that he understood - you really repent and want him to be around. You really love and you can not live without it. You will never abandon it and repeat your mistakes. Words, in this case, can be different. The main thing is that they go from the heart. If the guy still loves you, one conversation may be enough to bring everything back to normal.
The situation is much worse when the parting took place with screams, scandals and treason. What words can you return your boyfriend in such a difficult situation? Here one can not manage with one conversation. The young man just left a big sludge, anger and resentment. Besides, he has lost confidence in you and now will think a hundred times before believing in at least one word that you said. Here you have to spend more than one day to convince him of the sincerity of feelings, besides, no one can guarantee that the result will still be positive. But if you really love, then you need to fight to the last. Therefore, with all your strength, try to gain confidence again. There are a lot of ways for this, and it all depends on what your guy is and how much you hurt him.
It is easier to renew feelings when there is an opportunity though somehow to contact with the person. If you study together, work or are friends with some people, then you have more chances to convince him. By the way, do not go after a young man and bore telling how you love him. In this case, actions will be a better argument than words. Therefore, try to show your concern, try to help than you can, but, in no case do not do it for the show. The fact that you help, the guy will always know, but if you yourself will emphasize this, he, again, will take all for falsehood and will not believe any of your actions.
Try to get close to him, but do not push or insist. Give the young man to understand that you repent, love and experience, but respect him, so put up with any choice. Remember that you really can not make up, so try not to hope too much. So it will be much easier for you to survive failure.
The worst and most unfortunate option is that you do not have common ground. In this case, it is very difficult to call a person into contact. Offended guy, most likely, by any means will avoid meetings and communication. Here, willy-nilly will have to be intrusive. Although you yourself must understand that this can also repel, but there is simply no other way out. Try to see him, talk, try to explain to the guy that you were wrong and very sorry about what happened. Send him messages in contact, send sms, but do not do it too often. Give him time to think things over, do not interfere with the space from which he struck you. In this situation, it is very important in all things to have a measure and not to overdo it so that your apology does not turn into a miserable performance, from which the young man, in the end, will become simply disgusting. That's why, you should not beg and beg. Even if you offended the guy, his own humiliation will not exactly bring his feelings back. Repentance and becoming a rag are two completely different things.
Correctly asking for forgiveness is also an art. You know what annoys your lover, and what actions he respects. It is always necessary to start from this. Before each conversation, every meeting, think over your words, not to say something superfluous and do not turn everything into another scandal. Do not forget that he does not have to listen to you, see and know you. In what happened, you are to blame, here you have to fight it yourself. Of course, all people tend to be wrong, but because of your mistake, it hurt a person. Therefore, you now get what you deserve. Accept this, but do not reproach yourself and do not engage in self-flagellation. Just draw the necessary conclusions and try to prove to the guy that you have learned this life lesson and are not going to repeat your mistakes, thus, hurting him.
The offended person is difficult to convince, but, nevertheless, sooner or later he will feel sincerity and will believe in it. People are still able to distinguish the truth from falsehood and if the young man still has feelings - he will be able to forgive. But for this you need to be patient and understanding. Do not turn into a hysterical maniacal inclinations, which walks on the heels of a man. Just try to be there when it's necessary, support, help and just talk about what you love, love more than life. Do not demand relationships and love, but do so that the guy understands - it will be for you the greatest happiness and gift. And if he comes back - take care of your happiness and never again be so wrong.