Why would my guy friend who used to party with me just me suddenly only want to come if the other two girls come?

Like he will hang out with me for coffee’s and stuff but me and him used to party all the time and now he will only do it if the other two girls from out of town are coming. It’s like he feels like he’s betraying them or something it’s weird

Why would my guy friend who used to party with me just me suddenly only want to come if the other two girls come?
Post Opinion