I (28m) broke up with my ex (27f) 3 months ago and she got engaged 2 weeks later, Now I feel confused and unsure about dating again

Hi, I'm sorry if this might be long, I just need help in my situation. I was in a relationship with my ex from high school up until 3 months ago. She was my first real relationship and we were each other's firsts. We were together for 8 years and spent most of our 20s together. I went through a rough patch the past year, I lost my job and was depressed. She was there for me and helped me through most of it. I eventually got a new job and eventually felt better but after that, I found out she was cheating. It hurt me so much but she begged me to give her another chance, I didn't. After a month of being broken up with, I found out she got married. I was in a state of disbelief, I didn't know how to feel. I eventually felt confused and unsure. I had no idea she was dating someone else let alone engaged. <br><br><br>I feel like I'm in a state of disarray. I've been questioning myself a lot and my confidence started to dwindle. I don't know if I'm good enough and I started to feel I'll be alone forever. I'm also feeling angry, I just feel like she was with him all along and she was just using me until she found someone better. I don't want to feel this way. I just want to move on with my life and be happy. I feel like I'm just living in the past and I need to move forward. I just don't know what to do anymore. I feel stuck and I need help and advice.