Not Sure On What I Should Do ?

I met this girl in September 2019. It was the best connection I ever had. We were inseparable. My brother passed January 2020. My hear instantly went numb. I missed special days suck as Valentine’s Day and her birthday. She remained by my side. We Continued our friendship throughout the year. I became very argumentative because I was grieving and battling depression. Thanksgiving was a tough day for me. I ended up crying that whole day due to the loss of my brother. I contacted her for comfort because she has always been there for me. She was busy and did not understand the state of mind I was in and hung up on me. I called back and just lost it. I disrespected her bad. I had never disrespected her before. I apologized repeatedly. Over the next 2 months I begging to panic in fear of loosing her. I stay to blow her phone up until she blocked me on everything. She ended up leaving me for a rebound. I do take accountability in pushing her away though. I think her rebound just ended. Since thanksgiving I’ve got myself together. I go to counseling work out and read books. I feel like I am back to myself. I love her so much and want to show her the man I’ve grown into. I’m not sure if she feels the same way about me. Should I pursue her if she left me at my lowest point ? Can we move past this due to me going through a life changing experience ? I don’t know if things will ever be the same. Or should I just let it go ?