Some behaviors are just behaviors and habits snd could be adjusted but some behaviors are just who the person is.

People can try to mold themselves and make changes, but it won’t change who they are at their core, so they are very likely to always relapse... because people are who they are (unless someone is very young and still growing)

It’s hard to tell what’s a habit and what’s person’s true nature until we know them for a long time. But even then it’s hard to tell. Hard to tell what habits and behaviors you can live with and what behaviors are absolute deal breakers until you reached that point and can apply it to future relationships. It’s not easy to navigate all that.

You don’t have to make a decision to leave or stay. When you are ready, then you make a decision. For now you can just observe and see how things go. No need to kick yourself or think “what if”. One never knows.