Can someone maybe give a good insight on why he is behaving like that?

Anonymous
Tonight is my aunts bday-dinner and I will see my cousin/bro, we grew up together and used to be really close... I wanna be prepared to confront him again.

So he is in a serious relationship since 2 years., she is nice but he is ignoring me when she is around (she is basically glued to him) or like all my texts. I gave up reaching out to him at this point.

If I see him spontaneously without her, he is acting normal but if she is with him he doesn't even say hi.
I did confront him about that and he just laughed and said nothing.
Even my aunt and mom had asked him about his behavior towards me and he was silent again.

I know that his girlfriend is super jealous but she said she has no reason with me cause I'm family... so I don't get that. Like what the fuck?
Also I always include her too when I'm asking to hangout or inviting to my bday etc. (And then get no answers.)

I wanna make clear tho I understand that his relationship comes first to him. I totally respect that!
But he could at least stop being so shitty to me for no reason... he is still normal with everyone else...
Updates
1 y
Soo at dinner I must confess I did act a little petty towards him out of hurt but still, yeah I did lol Anyw. I'm still clueless, somehow my mom catched him first, she said later that she just reminded him of who was more a sister to him and not to worry. And when I tried talking to him, he just said that we won't have a talk and this is a bday and after that he acted normal for the night. But I will not text him in the future, it's on him now tho
Can someone maybe give a good insight on why he is behaving like that?
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