I can relate to how you’re feeling. I separated from my wife last March (my decision) for the same reasons as yourself, in that we were butting heads and bickering all the time just making the relationship very unenjoyable!
Even though it was my choice and we are very amicable I still couldn’t help but feel saddened and disheartened ( and truthfully a fair bit jealous) when 10 weeks later she was as posting pictures on Facebook of “date night” and “lunch treats”…however…I soon realised that me moping around comparing my singledom with hers and other people’s seemingly happy dating lives was not going to achieve anything. I (maybe extremely) deleted all social media accounts and have since just got on with planning what I want to do with my little girl each week and my free time and then just gone out and done exactly that with nothing and nobody else to compare it to and the past year 10 months has actually been pretty great because of it.
My ex partner is now in a full relationship with this guy and seems happy and I’m actually really happy for her now because I’m using my energy to concentrate on me and my little girl and not spending it worrying and comparing to others. I’ve been on dates in that time and met some lovely ladies both non parents and single parents but I’ve not been disheartened when it’s not gone further than a few dates or they’ve not been right for me to pursue further. so that would be my advice…JUST DO YOU and enjoy the journey. 😊 x