am i allowed to be annoyed?

bella

okay so i lost my virginity to a friend in may. it was just a friends thing kind of just wanted to get it done before college in august. he is a year older and came home from college and it just sorta happened. before it did, i told him i was very nervous and like we had a heart to heart before and told him so very personal things. i told him i was scared he was just going to use me for sex and then never talk to me again and he swore that wouldn’t happen. he told me we could like hang out over the summer etc like “have fun”... well that didn’t happen. he had broken up with his gf like a week before we had sex and i knew about her. then the literal DAY after we had sex he texts me and says he needs to rethink some things. he says he misses his gf etc. i was like okay that’s fine... then he proceeds to completely ghost me after saying he regretted doing it. am i allowed to be annoyed that he lied to me and did exactly what he promised not to do? there was no expectation of a relationship but i did expect to stay friends like we had been. i just feel like i got used and was completely lied to!! how do i move on/ get over it? was it my fault or not?