pisces withholding sex?!

What's the lesson he's teaching me??
and yes i think that's true...he thought id be more open to casual sex im sure. if it makes any difference, he's Brazilian and once he graduates this summer, he doesn't know if he'll find a job here in the US or have to.go back home.
that makes everything more complicated cause i just keep thinking eventually he'll just leave anyways so why try.
I've tried dating other guys but something always brings me back to him. Sad Idk why