| Dump him. You can do better.
You're almost 16, you're young. If you see it on a myspace page and he's saying stuff and you've got people calling you and telling you that he's cheating, in my experience, he most likely is. 99% chance of it.
So here is what you do...you don't make a huge scene. You just tell him that it is over. And don't answer his calls, don't answer texts or IMs, just let him go. He obviously doesn't respect you, you've already asked him about it and so you've done your part. You can find someone that deserves you, cos this creep definitely doesn't. | 
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