Is there something wrong with me?

I'll keep it short. My girlfriend lied to me about a guy who was trying to pursue her, the guy was on the same badminton team as she was. She introrthe guy to me as a team mate lying to me when I asked if he was the pursuer. She was also so ready to go on a bus date with him and what not until I caught her red handed she was crying so I gave her a second chance but now my trust for her is sort of tainted. We both made it clear at the beginning of the relationship we will be honest and I have always been but her I don't know.. it's hard for me to trust her fully again.. I come from a fucked up family so I learnt to be faithful and honest to my partner.. I've been going to teraptand learning to control my overthinking and anger properly.. I know there's some issues with me.. but it can't all fully be my fault can it? I told my girlfriend also that I'll be very transparently honest (not to the point where it makes her uncomfortable sharing some parts of her private life) with her and hopes she does the same.. but ever since that incident it's been hard to fully trust.. and I've talked to her about it.. but my god is it hard for me not to keep reminding myself of that incident.. I'm very aware of what to do and not to do as I think from my gfs shoes too..
Is there something wrong with me?
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