I think this is one of those situations where it’s crept up on you & thrown you a bit. We like to think we’re in charge of our emotional choices - like attraction etc & like to have faith in our beliefs that happiness with my husband, or being old enough to be his mother type thing - will ensure things run smoothly. Then this happens where you find yourself connecting with someone when according to all of the rules you shouldn’t be.
I think what you’re saying is you never thought you’d be in this position. You’re not looking for anything, believe in monogamy, fidelity etc.
Everyone here is going with the morals of the situation - which is fair enough because nobody wants to be cheated on & cheating is wrong & damaging. Which you yourself believe in (rationally).
But I think you’re just trying to process that it’s even happening to you at all. It kind of shows that we can all be vulnerable to “temptation” even if on paper temptation would not come in the form it has for you - ie a junior colleague you oversee!
I think from what you say you’re not the sort of person to even think you’d need to protect yourself from temptation per se, but are maybe realising it happens & is actually happening to you.
I suppose when men use this as an excuse - we feel like they’re not taking responsibility for the reality of the situation.
We say come on as if you didn’t realise you were getting closer to this person - it just crept up on you?
I think you have to step back & realise that feelings & attractiveness & connections don’t stop just because you’re in a committed relationship.
Maybe it’s a realisation that you will have to actively work on such feelings, recognise them & then choose not to indulge in them - as they could genuinely be a threat to your marriage.
If you thought your DH was “connecting” with a younger woman at work - you probably would be concerned & disappointed (& have no sympathy whatsoever!)
Maybe it’s a bit of a shock & wake up call to you about the realities & difficulties of relationships in general & that you’re no different to anyone else in that regard.