How to get over breaking up with a girlfriend that was your best friend?

How to get over breaking up with a girlfriend that was your best friend.

Its been a year since we broke up,
I still get this really bad mood swings, bad temper and hate feelings. I dont like being alone and I dont like losing all what I had. I need to get over this person without losing myself in the process.
I dont like the person I am now because of a breakup.

Note:
- 5 years bestfriend /1 year girlfriend
- We broke up on good terms
- I wish her the best. I dont hate her
- We dont blame eachother for anything
- she got over me and has a new boyfriend
- My other best friend is her best friend too
How to get over breaking up with a girlfriend that was your best friend?
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