Do you think he likes me?

It would seem that he likes you but if he's with other girls (maybe multiple at a time) it doesn't sound too good. Maybe he doesn't want you to tell anyone because he doesn't want word getting out that he's with you. It could be because he is already with a girl and doesn't want her to get mad. Or he's friends might think badly of you and he doesn't want them knowing that he likes you, I've seen it. Just be friends with him and get to know him a little more and you'll know if you want to date him for real or not.

And think about this, where do you think the movie makers got the idea?

If the only time you talk to him in person is always romantic then I think he likes you, but for the wrong reasons. If most of your contacting is done online then he's trying to be all over you when he actually sees you. It appeals to you most likely because no one has showed you this kind of affection, right? You may be falling in love with this guy, but it isn't the type of love you think it is. Don't get puppy love confused with real love.

Judging by what you said about him always talking about this girl on his message, I think if you let things continue the way you are between you two then your going to get really hurt, really fast. Maybe it's not that, He might be trying to make you jealous. Set up a time where you guys can sit down and talk in person. Tell him about how you feel(use words,not actions) and see how he reacts. The only way to know his true feelings is to let him know yours first. Although he might just tell you want you want to hear, so look into his eyes when he replies to your feelings. Make sure if you guys talk that all you do is talk, don't get distracted by the 'romantic' things. There is plenty time for that after you figure out if this guy actually has feelings for you the way you want.