I've been in the same situation. Dated someone for 2 years and abruptly broke up. It hurt like hell. It was mutual but I must admit I embarrassingly and kinda desperately tried to get back together even though I knew we weren't right for eat other. For me it took like 8 months to get over it. At first I didn't care but a month or so after it hit.
You just have to find someone who loves you for you and understands your emotions. (Easier said than done and cliche but true)
It takes time but after you're over it you'll feel a lot better.
I would watch my fav movies and eat alone that made me feel better. Although I didn't have much of an appetite, always felt anxious.
As someone whose bipolar I needed to find someone who understood it for me. If they don't they'll grow tired of it thinking you can control it.