Try not to focus too much on what your W is doing with the OM. Our imaginations can be ten times worst than what is really happening. I thought my H was happy and life was great with is OW. In fact the fantasy relationship soon became a nightmare. He was so stressed he was having anxiety attacks.
The M may be dead for now. Who knows what the future holds. All you can do is focus on you and your kids. Plan your own holiday. Create new memories.
Take it one day at a time.
Me 52 H 44 T9 M 5 BD 12/11 H split 8/12 OW moved in 12/12 OW gone for good 6/14 We get closer again 9/14 SD 13 Me 4 Grown
Accept what is...let go of what was and have faith in what will be.