No, I do not use “you look sexy” to compliment a women I’m not in a relationship with.
That kind of talk, to my way of thinking, is hitting upon that person. As in I want to be in a relationship with you. However, that particular avenue of ice breaking would not be used by me. It has a creeper vibe about it. Shows the depth of your neighbour, IMO.
Of course, I’m not a 30 year old and may have a wee bit more vocabulary, and experience, to draw from. Lol.
D
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.