Boyfriend and other girls

Isabella • EJA 💕

So I recently found out that my boyfriend has been Snap chatting this girl he used to go to school with. He is a a year and a half older than me so he is out of school for 2 years now and so is she. From what I understand they didn't really know each other or talk that much in school but they knew each other. From my understanding there school is like 5x the size of mine because his town is way bigger. There was like 500 in his class and there's 30 in mine. Anyway, so I kind of let it go because I trust him that he wouldn't cheat or do anything stupid to fuck up what we have. We've been dating for about 4 and 1/2 months now and I noticed Monday that they have a 16 day streak and they are like best friends or some shit. And I asked him about it casually saying it was on my mind a lot and he got mad saying I didn't trust him. I just asked what they talk about and if he liked her because it seems like they talk a lot. So tonight we were talking and then after his haircut he said that he wasn't home and wouldn't be till like 10. We'll this bitch lives in the same town as he does and he's told me about her asking to hang out one time. Do you guys think I should be thinking they were hanging out or was he somewhere else? Like he all of a sudden stopped texting me back and he wasn't Snapchatting or anything. So idk what to think. It's not that I don't trust him because he can have other friends that are girls but to be honest my boy doesn't really have a lot of friends and he really doesn't hang out with many people. So I just don't why he would hang out with this girl because he knows she likes him but she doesn't know that he has a gf. Help! Give me your thoughts ladies!!!