Over eager Boyfriend

my boyfriend always wants to have sex. like all the time. and it makes me nervous because what if that's all he wants me for ? he swears up and down that hecloes me and he won't leave me. and I think I love him too, he makes me really happy. and it's not like I don't enjoy sex myself because I absolutely love it but I don't like feeling that we can only hang out if we fuck sometime during it. I just font know what to do because I'm a very submissive person so I always end up giving in but I just want to be comfortable in the relationship because besides that everything is great...any advice?