Tbh I don’t know what to do (any advice 😩)

So my “bf” of about a month now has kinda been ignoring me but I’m sure about. So recently the summer that we both went to ended and we said that we still continue to have a relationship and talk but I feel like it was a lie bc whenever I talk to him he either responds real late or doesn’t respond at all and I’m the one texting first he never texts me like before. He is the type of guy to have more female friends than male friends and that’s ok but when we’re at camp he was getting kinda close wit this girl (I’ll call her S and I’ll call him E)

When E first camp to camp he only knew like 2 ppl cause he went to school wit them and then when he got settled into the camp he got to know everybody. Ppl at my camp had this little club and E got invited to the club and they had snapchat GC and S was in it to so they kinda have each other’s SC. Today when I was talking to one of my friends that’s in the chat they say that he is always texting in the chat (morning and night) and I text him around those times and I think he’s texting her out of the gc but idk

Sorry that the story is so long but if y’all have any advice pls tell me cause this situation seems suspicious what do y’all think