weekends when your newly single

I think weekends are roughest after the break up and pending divorce. I used to look forward to weekends and I still do but I always feel like I should be doing something more exciting. I spent a lot of months grieving but I am not in that place anymore but I find myself without things to do or people to do them with. I put everything into my ex and kids and gave myself no social life. He has a girlfriend and he has her friends, I don't let it bother me like I used to but I still don't want to feel like the loser. I know it takes time and I have to rebuild but it just feels a little lonelier on the weekends.