My company went through a restructure in light of covid. Some people that were there aren't any more, my role is different and we have a few new people who started this month. One new guy is in 2 days a week and I'm flipping between 2 sites for the time being. Those 2 days we work together we clicked quite well together and built a rapport. Now, I'm happily married and made no secret about it from day one. He's engaged, from what I can gather quite happily. However, my spidy senses have recently begun to tingle, just something about his behaviour is giving me the warning bells, like feeling showered with attention, if you see what I mean. It's small things, like keeping me a seat next to him at the meetings, zooming in on me during lunchtime, confiding etc. All this I chalked down to friendship, but now I'm not so sure. I really can't emphasise enough how much this is unwarranted, but the team is just forming after a very brutal two years and a restructure, we're all still finding our balance. I don't want to risk discord, but likewise I have no interest whatsoever (and I'm being VERY careful to emphasise this) in anything unprofessional. I'm wondering if this is something to have a quiet chat with HR about (YANBU), or do I leave it for the time being and see what happens (YABU), as I really don't have anything solid to point out?