What should you do if you found numbers on your boyfriend's cell to a girl from work and his ex-girlfriend said he was cheating on you and you found out she drove you bf home even though he denied it?

If he denies it, then most likely.. He is cheating...

Watch out what any ex girlfriend would say. She could be angry and want to get even with him and that means making you doubt your relationship with him. However, he shouldn't have other girl's phone #'s on his cell. He owes you a better explanation than he has been giving you. If he refuses, kick this guy to the curb.