There's one thing that nobody has mentioned yet, so I'm gonna put it out there. Long distance relationships can be exciting and romantic, but at the end of the day- you're still alone. Your heart can get caught up in everything, and you feel involved, but he's not there with you. That can make some lonely nights. Long distance romances can be an emotional roller coaster.

Kinda like that. It can make you crazy sometimes.
I've tried it long distance relationships a couple times with mixed results.
One was somebody I met online and ended up talking to on phone regularly. It was romantic, he was very sweet, then he disappeared so completely Houdini would have been impressed. All I can figure is he met somebody closer and felt like it was easier to just drop contact than to say so. He'd been calling for months and didn't even say goodbye. From what I hear, that is kinda normal. I guess guys don't feel obligated to explain anything when you aren't around.

Not even being told it was over was rude, and this was somebody that acted like he was in love.
I also found my first husband again, online- after being apart for 15 years. We had a long distance romance for 6 months then he took a trip to my area, we got married and I moved out of state to be with him. He tried to be extremely open about himself, the good and the bad. I still missed seeing some things, cause I was remembering the way he used to be. But 15 years had changed him. He's a good man, and we've been remarried 2 and a half years now. But I still have moments of " Who is this guy? This is not what I expected! " He was trying to be honest at least.
It's also easy to see the best part of the person and not know the whole picture. Even if they are not trying to be deceptive, people still want to impress each other. So there's lots of little stuff that might drive you crazy about each other, that might surprise you both.
Try to stay objective about this guy that you are getting to know. It's easy to fall for the person you think he is. Just remember that you are young and will still be figuring out what you want your life to be like for quite a while. There's plenty of time for settling down with somebody after you get to know You.
By the way-
Hearing that he has a tendency to depression set off warning bells for me too. Guys tend to not admit to depression unless it is a big deal, so I hope he gets help with it. Romance makes it easy to ignore problems, but sooner or later- you gotta fix whatever is causing it.