My ex can't get over it?

It's been almost a year since we broke up, but he still calls me at least once a month and still brings me souvenirs when he travels. I feel terribly sorry for him, cause I know he's still deeply in love, but there's no chance we could get back together once again. I always try to push him away and not to lead him on, being as cold as I can, but he just can't realize it is over.

Have you ever been in a situation like this? I don't really know what to do. He keeps on asking me out as a friend but I'm afraid that if I ever accepted, I would hurt him even more than I've already done.

I feel terrible.
My ex can't get over it?
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