Does my boyfriends friend has a crush on me?

This is pretty long, sorry.

Me (F/22) Boyfriend (let's call him J, M/26), Friend (let's call him Z, M/20)

Are friends for longer than I know both. Met my boyfriend in 2024 and we're dating since. Currently going through a rough patch, probably breaking up.

J and I hosted a NYE party, around 14 people were sleeping over from the 27th-2nd.

Z and I were talking a lot even tho we never really talked before, we just played video games together with the others.

On NYE I got very drunk, can't remember 5-6hours.

I was crying a lot and venting to Z because I was so heartbroken. J never said "I love you" even though we've been dating for over a year and some other stuff.

Z comforted me a lot that night, was next to me when I slept in but there were other people in that room too and totally okay and normal for everyone.

Except J, he was never the jealous type but for some reason he got mad the next day and told me I was cuddling with Z when I slept in (which is not true, others confirmed)

I talked to Z and others what happend that night and it wasn't anything crazy or weird enough to react that way.

Now, he is suddenly fine with us being alone in a call (discord), playing games just 1 on 1 which we never did before. Whenever we talk about J he says that there are so many Redflags and the best decision would be to break up etc.

When we talked about NYE, I asked him why he was there for me almost the whole time when he could've asked J to take care of me & that it kinds looked like he had a thing for me. He said that he never had a crush or was in love, that he rejected some girls before and that "even if, that would never work out long term because of the friend group & my parents" etc.

Which I find a little weird because... Why would you even think about the possibility when you say you never had a crush etc. while the person you're talking about has a boyfriend which is also your friend?

There are days where we talk a lot and days where we just Co exist in call.

He doesn't really answer messages, like not even the ones from his friends so that's normal

Now the question... Is he lying and does he have a crush on me? I'm so confused and want to know for the sake of the group. If he has, I'm gonna think real hard about the next steps, if I might limit contact for a while or sum

Or is he just nice?