How to stop feeling like this

So my SO cheated on me and it's been 3 weeks since . I found out I was pregnant and we said we will work things out and he's only with that girl bc he got kicked out of his house , he moved In with the girl and hasn't talked to me in two weeks . I finally stopped crying every night , but then yesterday he popped up at my new job and then it started again, I know I should t be crying and I know I shouldn't be crying I've him like I hate myself for crying over him . I feel if I had a conversation with him about everything I will feel better but everything is bottled up rn , I have to tell everyone I'm over it or I will look stupid . But there's so much going on in my head. And I know I should t care because he isn't caring about me and that's what hurts the most it just feel like the 2 years we had together meant nothing to him . And now I'm feeling like how I'm going to tell my child they're father didn't want to be in there life . I just don't know how to control my feelings and it's not like me to cry . I have no one around me who has been in a similar situation . Anyone have advice to get over someone . And please don't say stop caring or just focus on yourself bc it's so hard when you have half of him in you