Being in a relationship with someone can be a really amazing thing for you at any given point in time, and a big part of the reason why that is the case has to do with the fact that it will enable you to share everything that you have in some way, shape or form. This will make it easier for the two of you to get through life since all of your problems would be solved through things like teamwork, although there will be a number of situations wherein you might feel like your trust has been betrayed at the very least to a certain extent.
A really good example of a situation where something like this might occur is if you are facing cheating girlfriend issues. Infidelity is arguably the worst thing that you could ever end up doing to someone or the other, and it often makes it really difficult for you to see that person in the same light ever again.
What you need to do if your girlfriend is cheating on you is to confront here about it and tell here that you know what she has been doing behind your back and that you really don’t appreciate her trying to make a fool out of you in this manner.
The confrontation is obviously going to be ugly, but this is no reason at all for you to think about shying away from it. Feeling like you can’t get out of the relationship is not going to be ideal for you at all, so you should never take these things lying down. It is important to always put yourself first when your girlfriend cheats on you.