Day 1 for the unpteenth time

Broke up with him 3 weeks ago now and the most days I went without texting him was 4 days. I just sent him a bunch of messages yesterday too but after the back n forth I just really need to be done with it. We have kids together and I’m currently pregnant but I think it will be best for us not to communicate for a long time. It’s just so hard starting out. I try writing in a journal but clearly that’s not helping me because as soon as I think of something I’ll text him going off. How do you guys control your emotions? I feel so weak