You can't. Alot of girls think that they can make us guys like you but when we like a girl, us guys are persistent and we usually go after that girl for awhile before moving to another. Just wait till he doesnt like her anymore than ask him out.
Just be yourself. If he likes you he will like you.
There is no way to make a guy like you by force. He eather likes you or doesnt, that is the bottom line.
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 ;)
Find out what he likes. When you find that he likes pretty girls or whatever, try to match it.
Be what the guy likes. If he likes bad girls, be one, if he likes tomboy's, be one, if he likes girlie girls, be one! Just keep on trying over and over again.
You Make Him Choose
You should tell the guy who likes you that you don't like him, but not until you ask the guy who you like if he likes you.
It can mean the guy YOU like, likes you. Or it can mean the guy you like's friend, likes you. Sorry if that doesn't make sense. I'm very bad at giving advice! :-)
ask him why he likes you and when he started liking you
Move on. You can't make someone like you.
Make sure that he knows that you like him as well.
Well they be what the guy likes. Here is example. If he likes bad girls, smart girls, nasty girls, etc. They will be that.