then i say go for it!
the boyfriend isn't going be around much consdering he's in jail, and she probably wont like the fact that he is never around and is really really bad, just be yourself and show her in small ways how much you care, and be very seductive, leave her wanting more everytime you leave her ;D
be there for her when her boyfriend isn't girls love guys that are always there whenever they need them =)
Ask her on a date
Then she has to choose you or her boyfriend.
Does the girl know you like her? How long have you an and your boyfriend been together? And are you asking what should you do?
It may be hard to do, but always talk to her... if she doesn't like you or doesn't feel right about the situation leave her alone and find someone better:D
Try an show her how cool you are compared to her boyfriend
If he is her boyfriend, hopefully, she would like him.
Wait till she doesn't have a boyfriend or move on
Treat her better than her boyfriend does.
Sentences are always adverse. How'd you like to go to jail? Sentences are always adverse. How'd you like to go to jail?
You get beat up
Find a way to impress her.