I just can’t help but to think that I am or can become compatible with my ex. Not sure if it’s lingering feelings or because I just care for her even though we have broken up.

The question on my mind is how similar should couple be? Must they have the same habits, interest and behaviours.
Now that I think that our financial habits starts to coincide, I feel that we are compatible. But I guess this might be lingering feelings.. Perhaps my criteria for selecting a life partner is not firm enough too.