There's a chance he could have been a stalker, but it comes across as coincidence more than stalking. When I was at university I'd keep on seeing certain people all the time around campus, and in town away from campus. It happened with a couple of people so much that I ended up feeling the need to hide from them on some occasions because I was paranoid they'd think I
was stalking them
. It's to be expected when you live in the same place.
To be honest, I may have been guilty of slightly stalker-like behaviour myself. Well, I don't know if you'd count the phenomenon of trying to accidentally-on-purpose bump into people as stalker-like. I've never found myself waiting outside people's homes or obsessing over them, but just every now and again, when I was at university, if I saw someone I liked (not necessarily romantically) walking into the pub on campus or something, I would follow them and hope they would notice me and come over for a chat because I obviously couldn't approach them myself. These would be people I vaguely already knew. I didn't do it every
time I saw someone, just the rare times that I was in the mood to talk to someone. And I wouldn't sit staring at them or anything, I'd just put myself in a position where they might possibly notice me. Is that weird?
There was also a guy who I suspect was doing this very thing with me. He seemed to live in the library, so every time I went in there, he'd be in there, and I started to notice that he would sometimes come and sit near me or next to me even. We never talked, but because we kept bumping into other we would sort of smile and say "hi" in recognition of each other. Anway, then I started noticing him in the pub whenever I went there to watch football. Sometimes I would leave the library or the pub, to get something to eat or whatever, and he would come out shortly afterwards. Not every time, but enough times that I noticed it. I would bump into him in the shops and a couple of times in town. Most of it was coincidence, but I got the feeling that sometimes he was trying to bump into me and talk to me. He seemed very shy himself. Anyway, one day I found myself sitting next to him at a computer in the library and after about ten minutes he got up to leave, and he was standing there rummaging away in his bag for ages. I finally looked up to see what he was doing and he suddenly thrust this piece of paper at me. I took it and said thanks and then he pretty much just ran
away, out of the library. The piece of paper was a note saying that he was sorry for his strange behaviour but he was very shy and not very good with the language (he was Japanese I think), and also that he'd noticed me for the first time ages ago, a good few months before I'd ever even seen him, and had been wanting to talk to me ever since but didn't know how. I didn't find it creepy because I've noticed people who haven't realised I existed before, and also he was obviously shy, maybe even shyer than me, although I would never in a million years write anybody a note.
Anyway, my point is, after this huuuuuuuuge post which I may later delete out of embarrassment, the guy you mention could have been a stalker, or it could have been coincidence, or he may have liked you but not known how to approach you, or something else. If I were you, I don't think I'd be able to decide on any one of those conclusions with any real certainty, although I don't think I'd be going with the stalker conclusion if those are your only reasons for it.