Friends and their boyfriends

So almost all of my best friends have boyfriends and between their jobs, family, other friends, and their boyfriends they have completely ditched me it feels like. I keep trying to make plans with them but they keep rejecting it and it’s to the point where I am so pissed off at them for that. I guess I am at my wits end with them and I haven’t done or said anything to them about it. I have been a supportive friend and I don’t know how much longer I can take it. Any advice?