How can I love myself?

I’ve been through some really shitty times. My ex husband told me I was worthless many times. He told me to kill myself many time and the list goes on and on.. I’m currently engaged to my new boyfriend of 2 years. We’ve had some rough times there in the beginning like him lying about smoking weed and coming home high all the time. “I don’t have a huge issue with weed just being lied about” he used to like other girls photos on Instagram and Facebook.. I’ve lost all self esteem and confidence. I never had much but all that I did have went down the drain.. my fiancé and I have been doing good he’s deleted Instagram and completely Cut out weed all together. But there’s times I just can’t stop thinking about everything that’s happened and it’s causing problems now... I just literally hate myself and appearance. I just had our child 2 months ago and feel disgusted with my body and face.. (mind you he liked these girls pics while I was pregnant).. but anyway. His friends will sometimes send him provocative memes and photos of girls and he will heart react them and it just really bothers me i know it probably shouldn’t but my confidence is shot.. what can or should I do