Is misunderstanding is common in relationship?

I met a guy in August and instantly found him sweet. I was one month out of a relationship at that moment, so I just wanted to stay friends since I didn't want to use him. When I was with him, my ex called me twice. Since it was just our second date, I told him it was just a friend, but he found out it wasn't and started calling me a liar and verbally abusing my character. We didn't talk for a few months, and then he hit me up again. This time, he asked me to stop talking to any potential lovers. I asked him to focus on building a connection before jumping to exclusivity, but he again started verbally abusing me and ran away to Bangalore. I booked the next flight and asked him to pick me up from the airport, which he didn't. Then he saw some guys sending me reels on Instagram and asked me to leave for Delhi and not disturb him. Each time he feels annoyed, he blocks me for days with no contact. He did the same in December, and I contacted my ex for something I thought would help him grow in life but didn't tell the current guy. He eventually found out and kept character-assassinating me. Since he blocks me and runs off to another city each time he is annoyed, I feel he's sleeping around, as he has slept with over 30 people. He has gone to Bangalore 5 times and blocked me for over 4 months in 8 months of this relationship. I have also not been completely there for him in his low days. I have deleted my Instagram account, left my job since he was suspicious, and cut off friends for him. He has started this new thing where he is self-harming and then asks me what I will do to make it up to him, then asks me to hurt myself. My birthday was 2 days ago, and we were in no contact, so he didn't wish me. He's in Bangalore and called my brother to ask me not to mail him. Now he's tweeting that he wants me to make an effort for him. My career is on hold. He continuously asks what I will give him and complains that his needs are not being fulfilled. I've lost weight and developed acne and weakness due to all this.