Sounds like you have a somewhat muddled notion of 'loyalty', Claire, misinterpreting it as 'faithfulness in relationships' or something like that.
Loyalty is sticking by someone's side, no matter what - even if the person commits something unspeakably despicable. Loyalty involves overriding (or even betraying) your own principles in favour of someone else. (I have max. 4-5 people in my life i'd do that for, including blood-relations (kids + sibling).
by Claire
What about people who are loyal to you? Why don't you see reason in being loyal in return?
Being loyal in return is simply wrong. It's not a trade with mutual obligations. If someone chooses to be loyal to you, it's their own private personal choice - nothing to do with you. You may not even like having their loyalty to you. Their voluntary loyalty does not entitle them to expect your loyalty in return.
It's like if someone is in love with you and expects (demands!) you to love them back, even if you wouldn't touch them with a ten foot pole - you see how wrong is that.
I've got BPD tendencies.
Figures, then. Sounds like you're justifying your codependency issues, no?
It seems the only reason someone wouldn't be loyal to someone loyal in return, is (...) lack of concern about their character....
Yes, and why do you expect the person to be concerned about your character? Just because you're concerned with theirs?