How do I reply to this guy friends mail? I have feelings for him, please advise me?

We've been great friends for 2 yrs even though living in 2 diff countries now. He calls / emails often %26amp; is truly emotionally supportive. We have common friends %26amp; he is a decent %26amp; v intelligent guy. I have feelings for him %26amp; he often flirts plus we did kiss the last time we met. He was going to visit but due to exams didnt %26amp; later admitted it was because I came on a bit too strong. Then 2 mths ago he contacted me a bit upset that his ex gf had met someone new even tho he was the one to end it as he was moving to another country. I told him to go after her ( as I believe he has to sort this out first). Then he contacted me last wk to invite me to see him, told me Im hot, intelligent, cool. Then he said he was going home %26amp; would meet his ex, that if it goes well he will get back with her %26amp; that he really didnt know how it would go but that next time I see him he may have a gf - her. I said 'ok, I wont come if you have a gf' %26amp; he said 'what, you don't like my company? we can be friends!'. Then I couldnt believe it, he mailed me yesterday from her city (he's home to see family %26amp; her) saying 'hey, just realised I've nothing to do here, kinda sad, how r u? what's up?'. This made me think, it is not going well with her, he wants to try with me. How do I reply? How do I reply to this guy friends mail? I have feelings for him, please advise me?
Wow, that guy is putting you through a roller coaster. I would just consider all he's done before the relationship starts. If that's his pattern, it may continue if you do get into a relationship with him. Plus, being in two different countries makes it a long distance relationship, and those are always strainful. Just keep all that in mind before you jump in. You'd probably be better off just remaining great friends and have his support that way. Good Luck.