Is my bf(27m) staying with me(24m) because of sex?

– we are international, ldr couple, about a bit less 1 year in.
– we are deeply into each other. But he’s not so confident if it’s longterm worthy. We share same values and common grounds but we are pretty different in personality.
– i haven’t felt not so many uncomfortableness about it and it’s normal to because we get to spend 24/7 with someone who’s a total individual. I was shocked that he said he doesn’t want to keep this relationship going.
– ironically he says all he wants is to be happy with me.
– he did that three times but i somehow convinced him and i’ll be there in his city soon for 3 weeks.
– he said i shouldn’t expect too much but i can come.
– he broke up with his ex with the same reason and also he wasn’t sexually attracted to her.
– but he is higly attracted to me sexually. Our sex is good and he expresses he misses my body a lot.
– when i say i miss you, that means i just miss being with him, spending times with him. But when i say that usually he answers ”me too”. Sometimes he says ”i miss you” first but it’s pretty rare.
– but he’s good at expressing how much he misses my body, our sex, how he wants to kiss me and stuffs.
– i am a bit sad that he’s only allowing me to be there in his city because of the sexual attraction. If there wasn’t a strong sexual attraction, then he would have gone cold turkey on me maybe?