I met my current girlfriend in college right before lockdown. While we met she was still with her boyfriend but she said it was basically over but I said I wouldn’t continue what we had unless she broke up with him and she did. During quarantine we basically spent everyday together, as well as with her friends as they would spend nights with my friends and I just chatting and having drinks. Overtime we developed a nice connection, but I graduated and went back home. For about a month we stopped talking and she eventually came to visit me and we became official shortly after.

Fast forward and our relationship has been going pretty well, she states that I’m the first person she considers to have as an actual partner, and I believe our level of communication is pretty well. The only red flags that come up are that she tends to hang out with people she has hooked up with prior, and I said as long as it’s platonic i wouldn’t mind. Some nights she’ll go out to their houses with her friends and hangout. Some nights she won’t respond and claims her phone dies, which I believe because she has pretty long days with short breaks in between. The only issue is that I overthink and my mind just begins to wander. I’ve lightly brought up this issue and she responded with not comparing past relationships, and that I need to not overthink.

How can I properly communicate this issue? And what are some steps to help build my level of trust towards her?