Give yourself time and space to distance yourself emotionally from it. Delve into something that lets you reestablish your identity and do independent personal growth, then use that regained confidence to find the kind of relationship you want. I just hike exhaustively until I no longer think about them or care what they’re doing, becoming more of a naturalist which helps my self-worth. In that community I can find people with similar politics who make better partners. If you try to rush your recovery from that relationship or turn to self-destruction instead of growth, you just further entrap yourself in the patterns that resulted in the last one.