One of my BIGGEST life regrets

Is not valuing the right way my 1st girlfriend. Is been 6 years since we broke up. We have reached out to each other a couple of times. I haven’t found someone that loved me the same way she did. She gave me unconditional love and I took it for granted. Rn I’m crying for her and for all the bad things I did on our relationship. There is days that I regret leaving her, miss her and just wish our relationship can go back together. I just have to learn from my mistakes and “keep your head up” like ppl say.