Leaving your BFF for your girlfriend?

Me and my cousin are of same age and ever since we were kids, we would always be together in everything. play, fight, eat, sleep everything. we knew eachother's secrets and always had eachothers back. We would call eachother everyday to update what's happening and how our day went. suddenly from last 10-ish months he began avoiding me. no calls, no texts, no replies... but he would put on insta stories and call my father, but not to me. This really hurt me knowing that we both are legit like BFF'S that our entire relatives loved. So i asked him in a huge para about how horrible I'm feeling. all he said was he has a girlfriend and the only condition she kept for him was, him not talking with me or talk about me (she knew about me cuz he told her about me). I really don't want to keep my ego infront of me and kick him out of my life but also don't wanna loose my self-respect. I really love him (ofc not in anyother way) and ik he too. But do you think he did the right thing? And would you do the same if you were in his shoes?
Also let me know, what should I do?

yes, I would Leave my cousin for my girlfriend (HE IS RIGHT)
no, I would not leave my cousin... i would rather ask my girlfriend not to be childish (HE IS WORNG)
Select gender and age to cast your vote:
Leaving your BFF for your girlfriend?
Post Opinion