How to get over cheating husband..?

I know this is stupid, but I’m desperate... I found out my husband, my best friend, the guy that I love SO much, had sex with his co-worker while I was pregnant.. our daughter is four months old so it happened over a year ago... but I just found out. I plan on leaving him, but I have to get my ducks in a row because we’re military and overseas. I wish I was one of those girls that’s like “screw him, I’m better than that.” And be strong. But I’m not gonna lie, I’m broken. I have been crying for a week straight. And I just picture him and her and can actually feel my heart hurting... is there anything that has helped someone get over a betrayal like this...? I’m just so... sad... and in such a dark place 😞 I need help...

***to answer some questions: I found out because I saw texts between them that insinuated they wanted to have sex. I asked him, he said it was just talk. But I didn’t believe him, so I asked her. She confessed. And once she did, he confessed to. He said it was because we were in a dark place in our marriage (which is true, it still not an excuse). And I have talked to other men to try and make myself feel better. But it hasn’t helped because I’m honestly numb and don’t care about what they have to say....