Feeling Sad in New Beginings

Today he had the kids for the first time in a month. So naturally I indulged in some much needed me time, I got my hair done, read my book & had a nap in the sun.
Of course the kids were hyper after a fun day with daddy and I’m glad they had fun but now I have to deal with the naughty behavior as a result.
I also found out that my neighbours offered to help him see the kids, he has just chosen not to see them. Obviously far too busy with his new girlfriend.
Yep, we were together for over 9 years, married nearly 6, separated for 5 weeks and he’s in a new relationship already. I found out after it was plastered all over facebook.
So I’m sad, very sad. I’m okay when I’m with people but on my own I’m struggling. I just want to feel normal again.