Do you think you could do it? Yes, if I really, really loved the person.
Are you doing the international dating now? Nope, I'm single.
Is it hard to deal with? Nope, being single is awesome.
What times do you wish they were with you and you resent them for it? I think it would be horrible for the fact you don't know if they were actually with someone else or what they were doing. Easy way to get cheated on.
I mean if you are going to date someone internationally, one of you has to finally be willing to make that move over to the other country for good. Which means you have to leave your own life behind, which will put a lot strain on the relationship. Like "I left my home for you! Why can't you do this for me!" Or something along those lines. So you have really love them for that.