He 说 he wouldn't have sex with me because i'm ugly?

Well 你 know what. Forget about that guy and find another dude who 你 likes 你 physically and have sex with that guy. He's not the only guy in the world.

If do not wants to have it with 你 then why he is still with 你 或者 why 你 demanded it from a person who thinks 你 are ugly

If he doesn't want to be doesn't have to. Try and find some other guy. Someone who truly does care about you. Looks don't matter but the 心 does.

he probably got aids hepatitis a - z and all the stds. not worth your time. the sex probably sucks too, i bet he doesnt even last as long as a vine video