I am going to challenge "The only reason."
I would suggest that even after we gain respect for ourselves our thinking is so convoluted from being in "separation mode" for so many eons that we stay nearby until INSIDE we feel we have done what we were meant to do in answering the magnetic call for help from this individual.
It IS by showing respect for ourselves that they will see that they are worthy of respect inside themselves as well. THAT may well be the reason we were drawn to them and let's value the time we shared that was good and release them with gentleness and a prayer for their well being if possible. If not, just run as fast as you can.
My "jaunts around the block" have left me solo for much of the past 18 years and that is not a bad thing. Even though I would have enjoyed it being otherwise, like you say here healthy boundaries have to prevail.
I am just suggesting we not find ways to guilt ourselves and enjoy what is good wherever we find it knowing that good experiences do not come with strings of betrayal and attack.
I look at it this way, what is good comes from Father in Heaven so I do not lose what was positive and can see when I need to draw some serious boundaries if abuse is recognized.
What is tough is when kindness is used to abuse and believe me it really is possible and very painful. I could not have endured had I not had my faith.
This is what I understand today and I hope to continue to learn.
Thanks, debi.