Stuck in a tough place right now ........

My ex and I dated for about a year and a half. We were inseparable. We linked every weekend. I became close to her daughter as well. My brother was killed. Suddenly my heart just went numb. I couldn’t give her the love she wanted. I was grieving and battling depression. She stayed by my side throughout the year. Holidays were tough for me. I broke down crying on thanksgiving because of my brother. I reached out to her for comfort because she always has been there for me. Honestly things had gotten rocky because of the state of mind I was in. I ended up snapping on her and disrespecting her bad. I had never disrespected her before. I apologized repeatedly and sent flowers to show how sorry I was. I continued to text and call her over a two month period before just falling back and working on myself and everything I was dealing with. To this day I go to counseling, hit the gym and read books to strengthen my mind. I spoke with her and few weeks ago and discussed where I was as a man then and where I am now. I feel like I have gotten back to myself and I know I can be a good man to her now. I feel like she is the love of my life and I have so much love for her and her daughter. The thing is, she has possibly moved on. She seems happy with the new guy and I don’t know if I should let it go. I’ve been with other women as well but she is where my heart is. Now days when I text her she doesn’t text back or answer my calls. I have a lot of regret in my heart because it seems like I did everything to push her away but I can’t beat myself up because I went through a traumatic experience. I have decided to just fall back and give her time and space because I know I put her through a lot dealing with me after my brother died. I can’t seem to stop shrink about her and if we will ever reunite. Any suggestions? What do you think ?