<human>: Hello reddit. I've never posted anything like this before so bear with me. 

Me (20F) and my boyfriend (20M) have been dating for two years. We both go to universities in different states so we are long distance for the school year and together on the summers back in our hometown. We love each other a ton and are very open about everything. Long distance has been working out great for us but I've noticed something a little strange in the past few months. My bf will occasionally (like twice a week) bring up in conversation this girl that he has classes with and lives on the same college dorm floor as. Let's call her Becca.  He doesn't say much about her, just that he saw her at chipotle or had a quick conversation with her, etc.  

So last week I went to go visit him at his college for the first time. I have never been to his college before because he wouldn't let me. We usually just meet up in our hometown or he comes to visit me at school. I always thought this was kinda weird because I really wanted to see what his school looked like but I didn't put to much thought into it until now. 

We were at the super market on Saturday night and we coincidentally ran into Becca. This is the part I need advice on. The meeting was veryyy awkward. Before she approached us my bf yelled out "hey Becca this is Saraaa (not my actual name)". It was almost as if he was announcing who I was (his girlfriend) before she could run up to him and hug/kiss him. 

I have been really worried about this for the past week because I could just sense that something wasn't right. I really don't think that he would ever cheat on me but now I am not sure. My bf insists that I'm overreacting and that he barely talks to/thinks about her. But I can't stop thinking about it. What do you guys think? Should I be worried about this or am I overreacting?

Can you provide a brief overview of the text?
<bot>: Visit long distance bf, we have brief encounter with girl he talks about a lot, i think he's cheating on me