Can’t stay wet

When my fiancé and I have sex, he usually starts by going down on me. When he does that, I squirt, obviously making me extremely wet. However, after that, I can’t stay wet. It’s almost like once he’s done going down on me and I’ve squirted, I’m tapped out because it usually ends up with me having to tell him to stop because I can’t keep going, so he finishes himself. I get sore from him lasting so long and not being able to stay dry. Don’t get me wrong, I’m attracted to my man, but I don’t know what’s wrong with me and it makes me feel extremely bad about myself because I can’t finish him off. I don’t like butt stuff so I can’t try anything there and he absolutely can’t get off just by me giving him head. What do I do?