actions speak louder than words, show her she can trust you.
well basically it depends on what happened that separated you two in the first place.....
you cant
Go back to him
u cant u lost her/him
he cant really like you if he is your ex he will be trying to get back with you then
Move on!
you cant have her back.
You prove to him that u really do love him and want him to forgive you!!!
you will have to earn the trust back and it will always be harder for him because he wont know if you will do it again.
She may get feelings back but the trust will be very faint or even inexistant until you make the steps to fix that. Even than there may be trust issues.
well he has to prove that if he loves you. He would be with you and you only. You cant trust everyone Eric Laster ^_^
ANSWER: Pardon me but if I were you I will be more concern on how my ex girlfriend will trust me again. Sex can wait, you need to get her trust towards you again or else you wondering if you can get her back in bed will be impossible.