Whether he's gay or bisexual is a moot point. He definitely prefers his boyfriend over you. If i were you I'd bail.

Sounds like being poly is not working out for you.

Does it mean anything that I said “Can’t wait to see you tomorrow ❤️ “ and he just read it and didn’t say anything back like usual ?

He also doesn’t wanna keep up our selfie streak of sending photos to each other nor does he save my photos anymore (we talk on Snapchat) and I feel like once, if, he breaks up with his boyfriend he’s gonna crawl back to me

Looks like both of you have multiple relationships. Whether he is gay or bi is a moot point because this would be the same problem regardless of Alex's gender since you feel he is taking some time from Avery.

Are you and Avery primary partners or are you non hierarchical? It seems like Avery and Alex have lots of new relationship energy. Did they just start dating? Is this your first new relationship for Avery?

The solution is you boring poly answer. A discussion about relationships, expectations and feelings. If it really doesn't feel right don't fall into the poly trap of not breaking up because you don't have to

I don’t think he’s necessarily a bad boyfriend anymore, maybe the poly thing just isn’t working or he will one day wanna spend more time with me