Teo guys lost an erection on me during intercourse and none of us finished.

This was my 10th time having sex tonight. This is my 3rd partner and I am 26. I just had one the night before, but don't call me a ****. I am just trying to cure this mental mess. I had my ex boyfriend 8 times, and he never went limp and always came even though I didn't. These other guys both went limp on me. One got exhausted he said and the other said he came a little but didn't come the whole way because he was waiting on me to and was trying to hold back, and then he lost his erection. I am so insecure, but I feel like I'm a total failure in bed when I can't even get the man off. They both said I was pretty good. One said I will learn to be better with experience, but he said he didn't want to sleep with me again because he only does one night stands or girlfriends and thinks FWB is immoral and I cried because I felt awful afterward and wanted to try sleeping with him again but he said no. We've known each other for several years. We started the friendship back up about a year ago, and we meet every month or so and usually have fun making out. We have a lot in common and things to talk about, and I wanted to see him again, but he acts like he doesn't want to, and there won't be anything physical anymore. I feel like ****. Is there something wrong with me? Am I doing something wrong in bed? I didn't think guys were supposed to/normally go limp halfway through. I feel like I'm not good at sex and I'm doing something wrong and they tell me I'm not, but I feel like it's a lie. Why do they go limp like that?