AITAH - being angry at my bestie for meeting a guy I dated

Its kinda recent but what happened so me and the guy are in like near breaking up basicly we are from same friend group. My bestie we know each other from collage and even have live together during semester. The guy is in group we both engage with on daily basis. so few month ago i started dating him and curently we are kinda breaking up but we still friend, still same group. Problem is my bestie told me she started writing with him and that he is going to hangout with her on sunday (its 3 hour drive for him).

Im obviously not really happy about it and not to mention they kinda were secretive about it but yeah i do have trust in my bestie that its friends only same for him. But i still feel shitty about it. Not to mention we still talk half the day playing games so idk help me reddit.

AITAH for feeling betrayed?