Attachment issues

2 years back, in a short-term course, I saw a guy, he's very attractive and popular. I'm an introvert and a boring person. I'll not talk to anyone particularly boys. I've heard he has a girlfriend, so I thought not to speak with him. Then, after a month, I heard he had become physical with someone else(she had a boyfriend) from our class, even though he had a girlfriend. Suddenly he became unattractive to me.

After 2 years, now I'm in heartbreak. He texts me online. I'm not interested so much. He said he lost his mother 1 year back, and after listening to that, I felt sad. He started talking to me every day, and he said he broke up and is single now. He says he loved me from the day he saw me and everything in detail about he's past. He says he'll marry me. I said, "I'm not interested in a relationship or friendships". So he pleased me, at least we can be friends, but he behaves differently, gives me attention and Princess treatment. I said Treat me normally but he always talks beyond. Idk it's manipulation or something. Then I suddenly stopped talking to him because I had attachment issues😞. I'm sure maybe I like him but it's not love.