Getting over breakup blues?

Alright so,I just ended a relationship of ten years.Things got pretty ugly and as of the moment, we're not even on civil terms. Part of me is relieved, but naturally part of me is sad.I just can't seem to get over the crappy feeling.I know all the obvious answers (keep busy,spend time with friends,meet new people)but the problem is, I don't have time for any of that. When I'm not working, I'm taking care of our two year old daughter plus squeezing in school and homework. I'm always busy but I just can't seem to shake it from my thoughts.To make it worse, he moved back in with his mom,who lives two houses away from me,so I know whenever he's not there and he's been out (and not come home) almost every single night. It drives me crazy knowing that he is out with not a care every night while I sit at home alone and take care of all of our responsibilities.What can I do to get over it when I'm stuck taking care of everything while I have to watch him act like an college frat boy next door?