Need to vent and maybe hear some words of wisdom

Long post.

Context: 6month relationship with a guy who is a foreigner, doing a PhD full time, on a scholarship.

Last month he's had some setback at school and started behaving oddly towards me. So now I get the feeling that he thinks I'm a distration and he only comes to me if I insist, he doesn't feel the need to be with me. Says he doesn't have time - when in reality he just seems to have a disorganized schedule... And sex has been scarce, even we try, it feels awkward - valentine's was a disaster (no sex happened and we just snuggled and then slept) 😖. So I like him a lot, he says he likes me and that he feels super confortable with me and can see us together a long time. We've talked and none of us wants to break up, just the tought makes me cry. he apologised for acting distant. I get that he has problems and his life isn't going so well... but I still feel that he doesn't value me enough, that we are acting super awkward together and I feel like crap for asking him for attention, i shouldn't have to...I'm not that king of desperate woman... i think frequently about breaking up and cry about it, I shouldn't feel like this, I should be happy... I just don't know how to fix whatever is wrong with us...:(