I'm confused, What's going on here?

About four months ago a work mate and I expressed our strong feelings for one another but he decided not to act upon because although we
are both unhappy in our relationships we are not the types to deceive and lie, that the damage and fallout caused would be too great and that
there were other ways to solve the underlying problems (he didn't explain what he meant by "other ways" even though I asked him). If the truth be told i would have risked it. Initially he seemed a little distant when we returned to work but recently (past 8 weeks) he's again very friendly which is great because we are back to our usual selves laughing together and teasing each other in a friendly way as before. However, his behaviour
around me I'm finding a little puzzling for instance whenever we are in a group he stares at me, I'm not talking quick glances here, I mean really stares sometimes for several minutes. If I look at him he doesn't smile and glance away as he did before, he carries on staring until I can no longer bear
it and look away. Also if I'm chatting to another male work mate he completely ignores me and doesn't even so much as say hi. However, if I see
him later that day when I'm on my own he's perfectly fine.
I'm confused as to what's going on in his mind? What should I do?
Thanks

Who ever knows what goes on in their minds, I'm not sure they do either. Just posted my own problem on here with the same question. Hard to know what to do
in your situation but if I was in that position I would pretend I don't see the stares, just talk pleasantly and friendly like I would to anyone else. I think if he is
trying to send you some sort of message he needs to think of a better way!