Relationship

Hi everyone I'am new here, during rebooting, fighting with my addiction. I know that, PMO has been really destructive for me, my life, my relations and for every part of my life probably. I was suffering and struggling with it from 12yo (now I am 22). I need some advices from You friends, because i don't know what to do. I had a girlfriend, older than me, we were together for 2,5 years with some break and we were friends for couple years earlier, i want to tell something about her first, she was my bestfriend, best i've ever had, she was really good for me, trust-worthy, so lovely, and always ready to listen me or help me with my problems, like everyone she's also had got some defects, easy get angry, i am quiet person, and we were arguing a lot, but we had got that mind connection. I don't why, i was wondering all the time "Do i love her?" "Maybe i should try something new and stop hurting her". She just wanted my attention, spending time together, but I couldn't get involved like she wanted. Once thought about other girls, get to know with them, once felt that i want to be with her. I didn't cheating her, but I decided to break up, stop hurting her, become friends and live our own lives. I started to talk, chat with other girls, but she's still in back of my mind, still wondering. Now I know she's got a new boyfriend. When she told me about it, it really hit me inside, but i didn't show it, smilled, told her that i'am happy and wish them everything good. I still thinking about her now, memories come back, still wondering "what if I left love of my life?". Can it be caused by PMO? What should I do? Let her go? Or maybe keep in contact, wait for NoFap effects and decide then? I know that i wasn't good boyfriend, and here is my next question "Is that doubts about my relation can be caused by PMO?" It was one of the biggest reasons why i started. Thank You for answers, advices and keep in nofap adventure.