It is hard to deal with, and I don't think there is a "right" way to cope. Lois is right though, you can't change your home timeline while you're here, and if you're sent back there's no guarantee you'll remember the things you've learned here.
So I think all you can do is try to focus on what's here and now. The friends you have, the opportunities you'll get. Maybe he'll come here and you can talk to him about it.
One piece of advice I do have is really, don't go looking at fan forums or anything along those lines. Because there will be some who love you, some who hate you, just like in real life. But reading the hate from some of them is hard to deal with. Trust me.