I do not believe if he cheats with you he will necessary cheat on you. Was it right? ABSOLUTELY NOT. There are a few reasons why this is not necessarily true in my book.
1. He was Immature
If he is young then he is a boy and if he is a boy he makes decisions using his penis and not his head nor heart. But this is not only young males; it can also be older individuals that just have not matured. As we know males take longer to mature than females. When a male is immature he is most likely selfish as well and will only think of his desires, needs and wants. It does not matter if they are in a relationship because at the end of the day they will do what they want to do and it’s all about them.
2. He was not into her anymore
Some guys do not want to get out of a relationship because they want someone “there” for them at all times even if they do no longer care about them. It could also be that they do not want to “hurt” the female but let’s be real with you acting like you are single but yet in a relationship you will end up hurting her more. So grow some and get out of the relationship.
3. He made a mistake and learned from it
We are all human beings and make mistakes. With that being said, it could have been something that he did wrong and learned from the situation. We all have experiences in life where we do something and it was not the right thing so next chance you get you will fix it. He could have cheated on his ex-girlfriend and of course the trust was no longer there, the relationship went downhill and the relationship came to an end. He probably saw how much she was hurt by the situation and he might not want to see his next partner hurt that way. So he might want to better himself. I mean there are a lot of things that could have happened but at the end of the day learning from your mistakes is what matters.
Please be aware that he could possibly cheat on you years down the road. Possibly, you have been in a long relationship or even married for several years. Remember temptation gets put in our way and although you try to avoid it years later it might finally get you. But if it was one time and a mistake and the love is real then you should let go and forgive. Sometimes love is all we have at the end of the day and you would not want to trade one human mistake for something that has become a part of you. However, if he does it again then it was not really a mistake the first time and he was neither sincere nor sorry for what he did. If he did it twice I would be warned that he could possibly do it over and over again.
Note: Not every man is the same nor a cheater how majority of females make them seem. Some take the right girl to open their eyes. Just because he did not do the girl before you right does not mean he will not do you right. After all you could possibly be what open his eyes.