The girl I like (and likes me too) doesn’t want anything serious, but wants to keep seeing me and that she isnt seeing or even talking to other people. What do I do?

I’ve been talking to this girl for just over 2 months now, and we both really like eachother. She just got out of a 2.5 year long relationship roughly 3 months ago. We live an hour away from eachother and still manage to spend time together at least 3 times a week. Somehow, naturally the topic of officially “dating” came up (important: while telling me she had feelings for me about a month ago, she told me that she wanted to stay single for at least the summer and didnt want anything serious) and I asked if her mind had changed from her original “I don’t want anything serious for at least the summer” thing. She told me that her mind hadn’t changed, but also told me that she is only seeing and talking to me.

I’m a fairly anxious person, and I don’t really talk to any other girls while I’m talking to one, thats always felt wrong to me, however while I’m with her I’ll sometimes glance over at her and see her snapchat open with multiple guys names on her screen, which leads me to believe that she was lying about not seeing other guys just to keep me around.

This is all really confusing to me because this girl is one of the sweetest people I’ve met. I don’t want to believe she was lying about seeing/talking to a bunch of guys. Even if we aren’t in an official relationship, it’d still hurt to be lied to about something like that, and would leave me pretty uncertain that she wouldn’t do the same thing if we did eventually have an “official” relationship.

Am I really overthinking this so much? I’ve really never been so confused, I just don’t know what to think. If anyones ever had a situation similar to this and could shed some light on what I should do/expect, please do.