Breakup depression.. What to do?

Hi girls. So my boyfriend and I broke up this past weekend and I don't know what to do. I am so depressed and so frustrated, angry and just lost. I'm completely lost. I know a lot of it was my fault. I just wanted him to give me one last chance. He told me he stopped loving me and it was hard for him to think about marrying me. He said he started liking another girl. I know I shouldn't be sad because clearly he's not worth it. But we did everything together. I loved him so much and still do, he was my absolute best friend.  I'm at such a loss of what to do with myself. This is the worse breakup I have ever had and we were together 2 years. It's so bad I can't even think of ever being with someone else. I skipped work today but I have to go back tomorrow and it's going to be hard as I work with children and so I have to be okay. What do you do when you experience a painful breakup like this?