It sounds like he is really into you to be honest. If he is coming to see you soon, then I see no trouble in pursuing a relationship with him. He obviously means a lot to you, and you to him. I had a similar situation to you. I met this girl who was an exchange student, we instantly clicked. Spent almost everyday together.
A month ago she had to go back to her home country, so it was hard on the both of us, both we both decided to carry on with our relationship.
I went over to see her 2 weeks ago, and I can proudly call her my Fiancee.
Stick with it. Go for it! Ask yourself if you'd regret letting it go