I just need to vent!

My ex boyfriend left me in 2016 and I’m still hurt. I always ask myself why wasn’t enough for him and how come he got a new girlfriend two weeks later. He was so good to me, treated me with respect and like a queen. I was good to him too, did everything to make him feel comfortable and cared about. I told him in the beginning of our relationship that I suffered from bad anxiety and he told me he was going to stick by my side but I guess he got tired of me not wanting to step outside of my comfort zone. It hurts to see him happy with another woman and they have a child together now. I have a child now too which he keeps me grounded for sure! But some nights when I feel lonely and need affection I think about my ex,I wish I could just let him go