I'd better be Prudence!!!

Hey, be prudent!!!

"Don't waste your time on someone who doesn't want to waste his time on you"

Or you can say, "Don't spend your time on someone who doesn't spend his time on you."

Moreover, those above two can also be difined.. "Don't spend your time on someone who doesn't give a shit about you."

Is it clear enough???
It can't be more exact cause I believe both of us are clever.

I'd better change my English name into "Prudence" so that I could be smarter and... prudent!!!