If I'm noticing you, paying you attention and I'm attracted to you ...
... chances are you already have a wife/girlfriend.
You seem nice. You appear to be shy and modest. You carry yourself well. I could get to know you. But I already know the end of the story.
You're happy and content with me walking away from you. You're happy to remain distant and unknowable to be. You're not going out of your way to let ke know thst you'd like for us to get to know each other.
I can accept that.
I can still be attracted to you and take notice of what I like about you for future reference. But I'm not going to voice to you my attraction and interest. I'm not going to build myself up to like you only for you to tell me about her.
Instead, I'll thank you for the great conversation we've had, wish you a good day, and hope that things work out for you.
If I'm noticing you, paying you attention and I'm attracted to you, chances are you likely already have a wife or girlfriend.
That is all.
~ Me