Unconditional love is possible.
Doesn't mean you have to take disrespect. Love can exist even after the person or persons leave, as it stems from your heart and not their actions. Their choices and actions may define their presence or absence in your life. But it will never define love from the heart.
But I do beg you, Never stay if anyone treats you without respect. Never stay if they don't value you. Never stay if they don't see you for who you are. Love yourself enough, to walk away.