Burning after partner ejaculates in you!!

Hello ladies 💓, I have a question that I’ve been waiting to ask for a while now. So I just started having sex a little less than a year ago, and every time my boyfriend cums in me my vagina starts burning with extreme pain after a minute or 2 , the pain its so uncomfortable that we can’t keep going since we usually go for a few rounds. Here’s the thing though with the first guy I had sex with ( he raped me so I only had intercourse with that guy once ) it didn’t happen , the burning sensation was not there and I’m sure he cummed in me. But with my boyfriend it always happens, is it normal? Does anybody else have this problem?