is he only using me ?

oh ladies! I just got into a relationship with a long time friend. We have hooked up two times in the past. In our intimate time it wasn’t oral sex. Well, he has given me head before, but not because i ask for it. If he don’t wanna do it then that’s fine by me. I gave head before but not to him, and that one time made me realize that giving head isnt for me. Now, i told my boyfriend that i’m not about it but he still insist that i should do it. We have been arguing about this yesterday and today. He says that it is childish. I told him maybe its because he never had someone who didn’t like it. He said he did. So, i asked, “and that’s why you left her?” and he said yes. Now, to me that’s childish. In your opinion is giving head part of sex? yes or no? Why?