I've found, for me, after past breakups, worked was setting a time span, to grieve. During these times, I would take a good hard look at myself, my role, what I learned, what qualities did I like, which ones I didn't, what did I lose, what did I gain.
Tossed myself back into friends, family, school/work, hobbies.
I discovered what I needed to watch for, with deal breaker lists, so to speak. It's a lot of hard work.

Takes being a complete person, again, to be back on the playing field. With knowledge that you can be a whole person with or without a romantic relationship, then you'll be more likely to attract a whole complete person, that is complementary to who you are and vice versa.