Does this sound like autism?

Just to preface, he is 23. He has been diagnosed with ADHD, depression, and something similar to bipolar disorder. He had a test done for it as a kid but his parents were really ambiguous on what the result was so I’m not sure.

Anyway, my fiancé has a lot of traits or symptoms that I think align closely with autism, and it’s something I’ve always wondered about. As a kid, he had a short temper and was very picky. Didn’t like being touched. Got in trouble a lot.

As an adult, I’ve noticed he’s very peculiar about things. It has to be done a certain way, almost like OCD but not quite. I can’t ask anything of him immediately or rush things because it will make his mind run (that could just be ADHD). But the biggest thing is that he is not good at social cues. It’s like he’s socially awkward but the thing is he thinks he knows what’s going on but he doesn’t. Like, he’ll think a conversation is about something but it’s actually about something else. Or he’ll misinterpret what someone means or says. It gets kind of embarrassing at times but I obviously don’t tell him that.

He still has a temper and gets irritated really quickly. It used to be a lot worse but he’s medicated for it now. Also, he acts selfish. Like it’s hard to explain because he doesn’t mean to but can’t help it. Like in conversations, he’ll turn a conversation to be about him when it has nothing to do with him. It gets really awkward.

Does anyone with autism or know someone with autism thinks this sounds like it or am I completely off base? Thing is he acts just like my little brother who I’m pretty sure was diagnosed with high-functioning autism as a kid.

I’ve never brought it up to his psychiatrist either because I figure there’s no point. Not really much they can do about it at this point. I’m just wondering if that’s part of why he is the way is he.