Actually, I have never had this kind of problem - I don't know if I'm in love or it's just... something else.

So, I've been abroad on summer holidays for 40 days. In the house I have stayed in was one guy... We were quite close since we were hanging out all the time. Each day, I liked him more and more - till the day he said he was in love with me.
I started ignoring him but he stayed nice with me. I know it was wrong thing to do, but I just don't like when boys are being romantic - I always step back.
Anyway, he was always there for me and when I pulled myself back together, we started going on trips through his country every day. Only the two of us. I have never felt that safe in my whole life. Felt like everything is going to be all right, no matter what. And when I had to stay away from him for a few days, I felt like trowing up. Felt like I'm was going to choke. And all the problems I had there came to me, I started being aware of them - till I came back to his place.
But came the day I had to go home, far, far away from him. I really thought I was going to be all right and I didn't feel anything at first. And now... As each day goes by, I miss him more and more. It feels like I'm going to choke again. And it has been two months since the day I left.

I'm not sure what is this cause I've been in love before and it felt nothing like this.
Am I in love or I miss him as my best friend??
Please, can somebody tell me anything?

Thanks.