hurmotherof2 - I am so sorry you are having to go through this.
I remember when I had to almost 3 years now. At the beginning it was really tough. Just 6 weeks after my ex moved out he took all 3 of my kids to Disneyworld for a weeks vacation. It hurt so much for me - that had been our annual vacation for the last 4 years. It must have been awful for my kiddos having their vacation without their Mum there.
My ex just did not get it - it was all about him recreating this "fun new family". Such idiots
Try and take this time as an opportunity to have some "me" time. Reach out to friends - they will probably love to help you get through this.
My regret is that at the beginning I just sat at home crying all week long. I had a huge pity party for one all that week. I wish I had reached out.