I have a question for Bi men

Do you avoid getting with men for any reason? I know it may sound stupid, like "why would a bi man not date men?" But hear me out, I'm gay and in high-school. I like muscle-y men and athletes. The three men I've talked to have all been bi. The first was closeted and kept me around until he had a girl ask him out. The second one had a female ex and talked to her while he was trying to pursue me (?). The third one is the current one and we've been on two dates but I just found out that he had pleaded to get back with his female ex and is now talking to another female.

I'm high key crashing out but I'm just asking, are most Bi men like this? I already have the fear of a man leaving me for a woman because he can have blood related children and other parts, but my first and only experiences have been a tragedy and now I have fears about everything that can go wrong