32M broke up with me 33F during a family crisis

Ive been dating this guy on and off for 6 months. The off periods were mainly because of his infidelity. 2 months ago he begged me to give him another chance. I'm talking, dozens of calls, texts, sad voicemails, social media posts, gifts to my doorstep... The context was that he started putting the work into certain areas of his life and he wanted me to see the changes and prove that he could change.

I really cared about this guy and wanted to support him on his journey so I agreed. I laid out what I needed and boundaries, he agreed. He started medication, was consistent with therapy and psychiatry, he was being communicative with me consistently.

The first month was amazing. We were very much in the honeymoon phase. Then it started feeling different. We were arguing all the time, he had a mean demeanor towards me alot, he started accusing me of taking his stuff or not caring about him. In between these things he would do something really caring or sweet though so I felt like I was in a constant state of confusion and anxiety.

Valentine's comes around and I was embarrassed because I put way more thought and effort into what I did for him than he did for me. We got into an argument the night before because he had made his following lists on social media private, claiming some stupid excuse. When he made it public again, he had deleted several accounts.

At this point I'm just ready to leave, I'm checked out. Then, I have major family crisis which is still ongoing. My son and I have been sick all week (not his son). I basically decide I'm going to call it off because I truly cannot deal with my own crisis and his issues and how he treats me anymore.

We talk on the phone on Monday, he basically tells me he's going to wait for me forever and that I am the love of his life. He wants to be there for me in my time of need, he wants to be patient, etc etc.

The very next day he texts me saying he doesn't want to be apart of my family crisis and that he hopes I "figure it out". He says he wants to find someone who appreciates him. I just reply, "ok" and block him on everything.

What are some things I can do to help regulate my nervous system and ensure I don't get caught in his web again if he comes back?

Tldr; bf broke up with me after I forgave him for cheating because I was having a family crisis