Advice!!!

For some reason I have a really hard time giving my boyfriend head. I just can’t do it. I use to love giving it. But the past 2 years I hate it. I hate the taste of his pre-cum I hate everything about it. It makes me gag. I’ll have moments where I wanna just go at it. But then I know I’ll gag. I don’t know what to do. Please share some ideas?

I know he’s thicker and larger than my ex was. I don’t know if that could be one of the issues?