Great guy friend turned annoying friend? help

This guy and I have been friends for a little over a year and he has tried to get me to start a relationship with him, have sex...everything. We would go out and play pool, go to strip clubs, talk about relationships we have been in and give advice to each other about the relationships. I wasn't attracted to him at first, but recently he has seemed attractive. Attractive enough to the point that we slept together about a month ago. I told him that I didn't want our friendship to change because he is a great friend, and that's what I was afraid of. I told him that what happened happened, and there is nothing more to it. I wish I could take it back, but that's life. Anyways, he texts me more than usual, to the point that he is annoying. He texts and if I don't respond within so many minutes, he trips out. I told him I don't want a relationship and if I could take back that one night, I would. After an event like this happens with a good friend, how can you remain friends and not let one night get in the way?
Great guy friend turned annoying friend? help
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