Have you cheated on someone

Have you ever cheated on someone (in a relationship)?

Hello hello, I have a real problem and I want to get rid of it.

I've been with my girlfriend for 2 months. Everything is going great without any problems.

Only with me it expresses internally .... my distrust of her, although she has never done anything bad to me (like cheating or hiding things) but there have been small lies from her that were an emergency for her I told her that I don't like this. But otherwise everything is fine, as long as it is not "unfamiliar" in the way. It proves a lot to me, everything, we see each other almost every day. Despite the happy relationship, I am partly suspicious ... I wonder how I can overcome it? I know she didn't do me any harm.

Is it because I've been betrayed before? I previously had a 1 1/2 year relationship in which I was cheated and before that I had another ... I was cheated too. And I've never cheated on a girl myself. And I know my girlfriend is not like that, who befriends every guy because she's been cheated on too. Still, I have to look at what she's doing every time, because I'm scared of losing her. I don't want to be cheated again, this is the worst pain ...

Can someone give me some advice on how to get over it? Would be very grateful :)