I've very conservative in some ways (and this is one of them) so I would never consider dating someone while still married, even if we lived separately.
However - I can totally understand being flattered and day-dreamy about the positive attention -from anyone much less someone you admire/crush on. Take the ego boost!!
I've been divorced for some time now and no one gives me a second glance much less asks me out on a date, lol. I think you are right and that healthy people attract healthy people. Just because this moment in time isn't right for dating doesn't mean there will never be one.
I also think that as healthy people we are attracted to other healthy people. I know in looking back on my dating life (waaaay back - ha!) I was very uncomfortable with the normal healthy guys and felt at ease with the unhealthy ones. I took that sense of ease as attraction and that we were a good fit. I didn't identify that at the time of course but it is clear in hindsight.