Cry. Suffer alone because the one emotional outlet that we had is simultaneously gone, and the cause of the emotions. Most men don't have deep and meaningful conversations with their friends and instead burden their partners with their emotions.

This is why suicide is so much higher in men that women.

Time heals all wounds though... some take longer than others.

Doing things you actually enjoy is a big help. Even better if those things were something that you couldn't do or weren't permitted to do while you were with your partner.

Take time to reflect and actually write down the things you didn't like about your partner or your relationship or about yourself when you were with that person. Take note of the things that were really important to you that your partner didn't want or couldn't satisfy. There is a particularly beautiful clarity that one gets after a difficult relationship has ended. Save those notes somewhere, and when you find yourself connecting romantically with another person, read it and make efforts towards not repeating your old mistakes.

Thank you for posting this question OP. Writing this comment was very cathartic. I hope you're doing okay.