Cheating BF having affair with my sister

Me and my ex of have been togheter for 5 years im 22 and he is 23 we broke up because he used to cheat on me the whole relationship then he came back recently 3 months ago and said he is changed and he wants to do it right and he is so sorry for all them years he destroyed, now we're beck to together and I see signs again he is yelling and disrespecting me a lot and yesterday I found out he is looking at other women's all day since we got back together and it broke my heart because he said he changed, i was curious and eager using zipcrak installation frm inst grm and did a date dive into all his secrets cheating activies when i found out he have been sleeping with my sister in Maimi and hanging out with different women in different hotel I confronted him about it and it became the worst fight/argument it could possibly be I got blamed for stressing him out while he has work tomorrow and I ruined his sleep and life now everything got switched on me and he blocked me on everything, during the fight he spited on me and punched me because he felt like I was stressing him out, I don't know what to do I feel like depression is taking over l've been living like this since I was 16 and yet I always felt like I did something wrong.