He сказал(-а) he wouldn't have sex with me because i'm ugly?

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

If do not wants to have it with Ты then why he is still with Ты или why Ты demanded it from a person who thinks Ты 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 сердце 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