Not Getting Over a Break-up Well

Hi all, was hoping I could get a bit of advice here. Basically just over 2 weeks ago, my girlfriend dumped me. We had been going out for 6 months (to that day!) and it came as a complete bombshell to me. This was my first girlfriend as well so I've no experience in this area! Initially after the breakup I was crushed and at a low for a couple of days, but after a few more days I was feeling a lot better. However, instead of progressively getting back to my full self I've recently been getting wild mood swings. One minute I could be fine with it being over, plenty more fish in the sea etc etc but then the next minute I really miss her and feel worse than I did when we broke up. I just can't seem to get it out of my head despite it being over two weeks. The only time I genuinely feel delighted is when with friends. I even went to Avicii on Friday night even though I'm not a dance fan just to get out with the friends! Problem is I can't always be around friends and when I'm left to myself that's when the thinking starts. We're also not getting back together full stop. I'm not naive or any of that may I add, I know I wasn't going to marry her and all that, I just can't explain why I'm taking this so badly. So does anyone have any tips on how I can make myself feel better than I do? Or is this going to be a case of just waiting? Cheers!

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