Is he cheating on me again?

Im 17 and my boyfriend is 18 and we have been together since January and i am absolutely in love with him and i have never felt this kind of love with anybody else. I just never ever want him to leave me because I just love him too much and we are even planning to have a baby. When we first got together he treated me soooo well but in July he started giving me dry replies to my texts, not wanting to see me as much, he would randomly start arguments with me over stupid things, call me rude names and make fun of me and so much more. He didn’t seem to love me anymore so i told my close friend Jada. My boyfriend doesn’t know i am friends with Jada so Jada snapped him to see if he would snap her back. She asked stuff like do you have a girlfriend and he would say “oh no of course not if i did i wouldn’t be talking to you” and planned to meet her and even said “when you come we could do something 😈” and i was heartbroken. We didn’t speak for a while but e said he is soooo sorry and i forgave him. However, at first after i forgave him it was all perfect but now he is starting to be dry with me again, ignoring me and all of that. He is even shouting girls out on his snapchat and replying to comments from girls on his pictures with emojis that are a bit... ummm. you get me?

So i feel like he is cheating obviously I can’t accuse him without actual proof that he is and i can’t get another friend to message him because he knows all my other friends 😬 What shall I do?? Is he cheating and is there a way to find out??

Thank u please no hate ❤️