He proposed then I found out he has a girlfriend

I just want to share this story.

I’ve been with this guy for approx. 3 1/2 yrs, in this time we broke up a couple(a lot of times) because we both did wrong in a way or another.. but everytime after 1 month or 2 after not talking, he always appeared to get back with me. He never got with other women while we were apart.anyway, we broke up in August. He tried to contact me a couple of times but i ignored him, but on 4th Oct, being my bday, he came to my window ( i live on the ground floor) to discuss with me. He said he will demonstrate me i can trust him and give him a chance. Fast forward one week later he proposed me with a beautiful ring. Cried, communicated, had a way better behaviour for 2 weeks.

Then one night I called him because he hasn’t replied for 2 hours, only to talk with his new girlfriend which answered his phone (she told me they got together 1month and a half ago). I hung up. He tried to call me 3 times later that night (last Saturday) but I haven’t replied.

That’s it.nothing more.

P.S : i told her then about the ring while we talked, she replied “what a surprise he got me one too” but i m pretty sure she said it out of jealousy

Also, I don t intend to talk/get back to him. 2 days prior to this, he broke my lip. And yes, he had abussive periods in the last 2 years. Mainly because he was frustrated i tried to move one and got with someone new everytime we broke up.

I just want to understand his reasoning/logic