Why?!

Whenever a person shows interest in me, even when I racionally know I don't like that person, I fell for them a bit.. is like if I know you like me and I care about not hurting your feelings, I wonder why (if you aren't) aren't you been nice to me today, flirt with the person.. nothing intense, just sweet, subtle and fun. Even get a little jealous sometimes with a thought of "don't flirt with him/her, he/she likes ME".

Those little actions I think can be noticeable to the other person and.. Idk.. get their hopes up.. when I know if they make even the slide move on asking me out or touching me I would say NO. Maybe I don't cut it off because I enjoy the other person attention :/ and that idea makes me feel so disappointed on myself.

I am not talking about been a provocative bitch, is more emotional than all I think is affecting me more than others T-T

I would appreciate an advice or reading a similar experience to know is something that can happen to others.