Why tf is a male friend of mine constantly mentioning his gf to me?

Context: i’m queer and asexual anyways but he doesn’t know, its strictly a platonic friendship. Sometimes we game together and hang, but it’s just a typical friendship.

Everything has been chill until he got a gf recently and he’s constantly bringing her up to me. I’m happy for him but it gets a point where we’re talking about something unrelated and 8/10 he turns it back to his gf (or an experience with her)?

He replies to my stories and mentions his gf, replies to ig notes (and my social media posts have nothing to do with relationships) and mentions his gf. Ex: I posted about skipping world cup tickets and he replied “omg if love to take my gf but she’s not into sports lol” ????

I ended up muting him bc atp i feel like im talking to the gf 😂

Obviously no way to know unless i bring it up to him, but just needed a place to voice my confusion and annoyance💀 Wtf is going on???