Hookups/Slipping condom off, why??

I met up with 2 guys to hook up (seperate times/days) and made sure to ask if they had condoms beforehand, BOTH of them pulled this dumb 💩 on me where I was turned around ( 🐕) and tried going in without putting the condom on (1st) I immediately caught on and was like “definitely not” and made him put it on. (Looking back I definitely should’ve up and left smh, I mean he was cool and everything was fine but like wtf??)

As for the second guy, he kept it on at first but at some point when we were doing doggy he took it off but didn’t say anything (I didn’t even notice until we switched positions) which is obviously how I know it didn’t just “fall off” because why wouldn’t you stop?? When I noticed and called him out he claimed it “fell off”. He put on another one (i think he purposely put it on wrong or it could’ve came off) but it was inside of me when he pulled out 😒 although there was semen in it so maybe it accidentally came off? I guess I was just untrustworthy based off his actions smh. *this was the second condom lol I know it came off after he finished, was sus at first until I seen semen inside*

I don’t understand why they do this, I’ve heard of it but I myself have NEVER experienced it until recently. It’s crazy. (I probably sound stupid, be nice, I’m not looking for anything serious, just a f buddy, although now I feel as though I’m not even good enough to F/keep around because I won’t have unprotected sex with these men smh.. even though I know their actions are unacceptable and I shouldn’t even care because they don’t even respect me..*sigh* I don’t know man :( }

I’m definitely on birth control .