What should I think?

I’ve been with my girlfriend for 4 months, known each other for 5. I’ve been with 53 girls before her, I’ve never been this consumed, and for both of us, this is so far our longest relationship. She’s been with 14 guys before me. we were at an amusement park yesterday, and she wanted to take my wallet and phone and put it in a bag so it wouldn’t get wet. We were with her family and I had a condom in my wallet. this was the first time I didn’t let her take it from me. but I know she takes my phone a lot, like when I go to the bathroom and my pants are in her room with her. so I asked her why, and she hesitated to tell me. but she said, “its because my ex cheated on me. with a girl that lived down the street from me. my little sister was the one who told me and she found out because my neighbors told her. it was like I wasn’t paying attention. I didn’t know what was going on. I’m just curious I guess. I don’t want to get hurt again” does she not trust me, or is it really just fear because of the other guy?