Why is my guy friend constantly avoiding being alone with me?

Anonymous
Me and my friend had been friends for 10 years. Recently I have developed a crush on him and have told him how I felt. He didn't feel the same way, and so we grew apart for a few months. I have since then dated other people. It seems like we're fine, and I thought we were back to being the way we were before. But right now he still avoids being alone with me. Every time I ask him to hang out by ourselves, he always rejects me. I called him out on it, and he says everything is fine, yet he's still doing it. We're fine hanging out in a group and we talk regularly online and SMS. I just want things to be normal again, and he's making it really hard to do so. Help!
Why is my guy friend constantly avoiding being alone with me?
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