Insecurities and low self esteem after separation

My husband and I have been separated for almost a year. We will be getting divorced. We spent 12 years together and have 3 kids. We were 15 and 18. Throughout the relationship, he cheated on me a lot. He was very controlling and jealous. He's also a very angry person. Throughout our relationship, he would accuse me of cheating, looking at other men, etc. Extremely toxic. I've been focusing on my kids, going to therapy, eating better, and working out regularly. I've slowly been figuring out who I am and what i want in life. Ive been having some issues with my confidence and self esteem. I feel terrible about myself. I feel ugly and gross. I started a new job in January. About a month or so ago, i noticed this cute guy walking around. I travel to different schools and he works at the school that my office is located in. When i first noticed him, we would pass by each other in the halls, make eye contact and then both put our heads down and walk away. That happened almost everyday. There have also been a few awkward interactions where ill look somewhere and he'll be there so Im overthinking, thinking that he thinks im staring at him. It has happened quite a bit to the point where I've barely seen him the last 2 weeks or so. The other day, I was talking to my coworker and i seen him in the corner of my eye. He was walking towards the area that i was at but then stopped, turned around, and went the long way around that avoided my area. My coworkers have told me to talk to him or just say hi but now I'm thinking that there had been so many awkward interactions that he is probably avoiding me and thinks Im a creep. I know this is long and off topic but it just made me realize how insecure I am. I'm not looking for anything but I've only been with one man so it's scary.