Boyfriends and blowjobs

So my boyfriend is on tablets that makes his ability to orgasm, or cum. I love pleasuring him, handjobs, blowjobs, anything, but because of this delay it can take him 1/2 hour sometimes to cum, which is great during sex but when I give him a blowjob it takes so much effort for me.

Sometimes when we're getting sexy and he wants that I don't want to give it to him and I don't give it to him because it takes so much time and effort, and I'd rather just have sex with him instead.

Does that make me a bad girlfriend?