He's always ignoring me!

Hi everyone!
First of all I'm from France so sorry if my english isn't great! I've been reading some of the posts and this seems like the right place to ask impossible questions

Here is the thing: I'm a 21 year old college student, my teacher is 31. I was in his class last year, but this year, although he still teaches at the same college, he is no longer my teacher.

the guy is not married, and I'm almost sure he hasn't had any serious relationship for the past year.

I am more than interested in this guy. There is absolutely nothing going on between us, we just have a great (and I mean great) platonic relationship. I guess you could say that we're friends. We don't spend time toghether outside the college, but then when we see eachother on the hallways and stuff like that we could spend hours talking, and sometimes, most of the times, we end up walking home togheter, or he offers to give me a ride home or sth...
It's been almost the same thing last year, so the annoying part is that
everybody thinks we have a thing going on.

Now everything was just fine until about 4 weeks ago, when I decided to simply tell him I'm interested... Which I did, without going over the top about it, one evening, when he was driving me home. I don't regret doing it, cause I was going out of my mind trying to figure out if he only likes me as his student (ok former student ) or maybe something more.

I was afraid he'll think I'm out of line but he was really great about it; from his initial reaction i'd say he was thrilled about it, but then he said that he's a teacher, I'm a student, he's not even allowed to think about that. So then I asked him if things could change next year (I'll be going to a totally different college) and the answer was the same, but then he kinda implied that in a hypothetical situation he really really likes me too, and would definetly consider dating me. Anyhows, we ended up talking for about 2-3 hours, bottom line was that nothing changes between us, we're just friends, but that next year.... you get the picture.

So far so good. The problem is that he's been avoiding me ever since. The longest conversation we've had is "Hi! How was your weekend?". I was always the one who made the first step and he was always in a hurry, or busy or whatever so I've decided to give him some space, so I've also been ignoring him a bit, thinking that eventually he'll come to me, but it's been four weeks now and nothing.
I really think he's afraid I want more (which I do, but I can wait).
So what do I do now? How do I tell him that I'm ok with us being just friends for now? I really don't want to lose what we had before...

Moreover, we have this little "ritual" every friday night after we both finish our classes we'd have a coffee at this nearby coffee-house (this goes back to last year, at first it wasn't really planned, we just both "happened" to be there, and eventually it became a regular thing). So last friday (I was really mad at him for ignoring me ) i simply asked him if we were gonna see eachother that night as usual or if it was still too weird, he doesn't say anything, I asked him if that means no, still no reply, so I just kept walking. needless to say we didn't go out.

What do you think? What should I do now?
Please don't tell me to move on... we used to get along great and I really think we have quite a lot of potential here (I know, I've said that before )

Thanks in advance for any help! And sorry this turned out to be quite long