What type of relationship is this?

There is one of my classmate. We do chatting on Insta but we never talk face to face cuz we both are introverts (maybe this is the reason or maybe I'm a shy person). He mostly act like he is my boyfriend. He also flirt with me and gets angry on me and so on. Sometimes he ask me my photos (ik that's all guys behaviour). Definitely, I've asked him so many time that he likes me or not, but he never respond. And sometimes if I'll ignore him then he will start saying that I'm cheating on him or I'm talking to other guys or I don't have time for him or I've change and so many things like this. Sometime he ignore me. And the biggest thing is that one day I asked him that what is luv for him, he just simply replied "efforts". I can understand his words but he never shows efforts towards me:( . This was from his side behavior.

From my side I'm so confused that am I in love with him? I always think about him. And whenever I miss him I always find a new message from him which makes me happy. Ofcourse I also flirt with him. N whenever he ignores me I felt bad. But Ik I'm never gonna accept that I'm in love with him cuz I don't have any feeling for him (maybe). And the most important thing is that maybe he thinks that I like him.

I just want to know that what type of relationship is this. He is not even my boyfriend. Am I just attracted towards him? Does he love me too? Why he never say that he loves me? Why he is just making me confuse. We aren't in a relationship so what is this?

What type of relationship is this?
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