So around 3 months ago I noticed a guy at work (I'd worked there about 4 months before and think we might have started around the same time.)
He was friendly with a guy on my team and he asked him if he was single, he said he was but only recently so wasn't interested in anyone. I started to chat to him and we'd email at work because I thought he was nice, good guy and we could at least be friends. The contact dwindled and I heard he got back with his girlfriend. Wasn't bothered, very much a case of wasn't meant to be and just a crush.
I hadn't messaged him in around 2 months and we haven't spoken either (not in a childish way just in a not making the effort way).
A new guy at work started and he asked me for my number and we started chatting, when he brought up the fact that he'd heard I like X (said in a jokey way). I said I thought he was nice but definitely no longer interested. I asked who told him and it turns out new guy had asked him who I was and X said - That's Valentine, she has a thing for me 
After 2 months of no contact wouldn't you assume that the person no longer liked you in that way and saying that could have potentially put new guy off from talking to me.
Now I don't think X fancies me but aibu to think he might be jealous because he no longer gets attention from me?
(Sorry if that last line comes across as superior, I am no beauty queen but I think most people enjoy having abit of attention and knowing someone likes them)