The only way you would know if he still likes her is if he is constantly talking about her during the time of your relationship with this person. There are other ways he could still like her too. Still has her phone number, she keeps coming around him, stares at her most of the time, keeps anything of the past like pictures, gifts, etc. He would rather hang around a place where she is near. Here are some few suggestions, but there could be other reasons the only way to be really sure is to ask him out in the open about his exgirlfriend and if he still feels anything for her.
he sounds like a jerk to me........cause no boy should ever tell a girl they like her and then get back with his exgirlfriend. Don't worry about it. He just wanted a girl by his side so he could get his exgirlfriend jealous. One way or another, he still have feelings for his exgirlfriend. I don't mean for you to get upset or anything, but its just the truth and your better off without him................just walk past him in the hall with your pride and he'll know that he messed with the wrong girl ;)
Ask her !
bum her and if she likes it u know
She likes to be mean and/or fierce in a nice way:)
If he's still hanging around or dating you then he still likes you.
ask him
what i do is get your friends to go ask him who he likes. if he likes you you call him or text him asking him out. you can also tell by the way he acts around you. if he smiles,talks,or do anything to get your attention still he likes you still.
when they dont break up with you
If you are friends and they maintain that relationship.
He still wants to be with you if he calls and is concerned about you
well Mandy if he liked u then he still must some how either a little bit or a lot he still likes u! well Mandy if he liked u then he still must some how either a little bit or a lot he still likes u!
ask him, or his friends.just be straight forward with him any descent human being deserves that at least and if he does then your prediction was right