My boyfriend says he can't promise he won't cheat... But why he's so jealous at me then?

yasmimfranx
First of all, besides that we have an absolutely amazing relationship, we are in deep love. He is caring, attentious and helps me with abasically anything in his powers. We have been physicaly together for about a year when I was studying in his country. But I had to leave and now we are forced into a long distance relationship for a few months before we can be together again.

Now, everything works great: communication, emotional connection, we even put it up even with some virtual spicy stuff.

However, he told me that he doesn't wanna hurt me or lie to me, but he does not think he will be able to abstain himself from having sex for too long. He talks about that and he never took the risk to promise he won't cheat on me.
He's also quite natural talking about his fantasies even if it envolves other girls, but he can't stand it if I ever mention other some fantasy involving another guy.

Even though he's very clear about this issue and won't promise anything, he gets extremely jealous and uneasy if I say it might also be true for me. He can't accept the idea of me being with other guys and thus rejected a long distance relationship.

He swears he loves me more than anyone he has ever loved before and so on. He says if one day we marry i will for sure be his only girl and he will make a vow. But before that, during the lond distance relationship, thats his situation.

It bothers me a lot and makes extremely frustrated. Honestly, I can abstain from sex for a long time, thats not the issue, but I can't stand the idea of him being with some other girl. I can't be constantly worried about him being with someone else. He also said he probably won't be able to confess it to me if it happens because i said I also probably won't be able to continue with him if I get to find it out.

So... I have to remark that I love him a lot and it won't help me if someone will tell me to just dump him and move on... If I didn't I wouldn't be able to even consider something like that...
Updates
+1 y
*I meant he rejected an open relationship
My boyfriend says he can't promise he won't cheat... But why he's so jealous at me then?
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