How can I get someone to acknowledge me?

There’s this guy that I know, and for the past few months hes been ignoring me for various and irrelevant reasons. He claims that he can’t email/call me because his online boyfriend wants him to talk exclusively to him, and only him.

I was friends with him for awhile, and we got along fairly well. I’d go to him for advice, he’d rant to me about how awful his relationship was and such. But after awhile, he just stopped talking to me.

Lately, I’ve been trying to, well, get him to acknowledge that I exist, even though I know that it won’t go anywhere. How can I get over him and move on?

note: he is really a she because he is using someone’s pictures and saying that they’re him. don’t ask how I know, that isn’t important. and no, i do not know him in real life. that isn’t relevant either.