Blowjobs

I’ve been with my boyfriend for a while and our sex life has never been as issue. Recently I’ve focused more on giving him a bj because whilst I’ve gone down on him we’ve always ended up having sex and I’ve never fully tried to get him to finish. Recently I have been and whilst he says some parts feel good ; as a whole he says it feels weird and he feels like he’s gonna pee. He cums during sex etc that’s not the issue it just seems to be with blowjobs. I’ve tried different techniques and the reaction is the same.

Any help or Advice?