My crush would talk to me but now becomes quiet around me and sort of avoids me, is he shy?

I have liked this guy for about a year now and up until about a few weeks ago it seemed like he liked me back, I would see him and he'd usually say "Hey" or "How's it going?" and I would answer him and we'd go about our business.

Well a few weeks ago, I was over by this building that he came out of (we're both at a University) and well I had just seen him come out and I suddenly got nervous thinking he'd think I was stalking him so I turned and looked at him and he didn't seem bothered but I know I gave him a weird look, so after that he started avoiding me not bad just changing his path if he saw me walk towards him. He would also look down and look sad

Last week the 2 times I saw him he didn't change his path and one day he even smiled a bit and waved. Today I saw him and he looked at me then looked down immediately and as he walked by he whispered "hi"

I'm just really confused if he is shy and if he possibly likes me back? My problem is I'm shy too so I'm not big on saying hi first.
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I forgot to mention I have told this guy that I like him but that was in April and because of my shy nature I wrote it on the back of a picture I drew for him. I have given him 3 pictures already and the 2nd one was the one I wrote it on the back, he never seemed to bothered with that...


in fact the 3rd time he said to me that I'm (me) a good artist and he looked on the back as though I had written something the back which I didn't that time.
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Also I usually have had guys tell me right away they didn't like me when I've told them I liked them, which with this guy I told him about 6 months ago and I guess I'm surprised it took him this long, since usually I've been rejected immediately
My crush would talk to me but now becomes quiet around me and sort of avoids me, is he shy?
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