Dont treat your girl bad, than she will cheat on you? Nice guys finish last?

:iagree:

 

Imo, stay a nice guy and try to find a nice girl. Do not change for no one, you have yourself to live with. If you think she is cheating and seeing signs of it, then she probally is, don't marry her! Whatever you do, don't marry her.
There are nice girls out there, you just have to find them.

Oh and another piece of advice, if you think she is cheating and you really don't want to know about the things she is doing, don't go looking for those things because you just might find it.