How do I stop a gay friend from replying me on my twitter?

[henry]

Yes I am a gay, but I never told it to anybody except to a gay friend who's already come out of the closet. I have no interest in developing a relationship with this gay friend. I don't even want to be too close to him as it will definitely expose myself. He doesn't think it that way. He'd always text me, call me and reply me on my twitter. My friends would see his reply. Every time I post something, he would be the first to reply. And he would always say something like "hey sweet heart, don't worry." "I can protect you." I am quite annoyed by his words but I don't feel it right to just point out that I want nothing to do with him.