He texts me 24/7 but says "we.re just friends."

Anonymous
I have been texting this guy that I've known for 4 years, he was never really my type but when I was having guy troubles a while back he was there for me. I started texting him randomly a few months later and I now have feelings for him, he knows that I like him and he always flirts with me, sometimes he jokes about sex too. He said he likes me as a friend but I don't get why he texts me 24/7 until 3 am, and always asks about my feelings if he likes me just in a friend way. I noticed that if I stop texting him he will send me three more until I reply to keep our convo going. I just don't get it. Last night he was joking about sex and I told him that I'm not interested in the subject, he then got defensive and said I flirted with him first (not true) and then he added that he "doesn't really date anyways" this was shocking to me because usually he is so sweet and sensitive, what's going on here? Is there a chance of us having a relationship if I hook up with him?
He texts me 24/7 but says "we.re just friends."
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