Not expectations but assumptions leads you to disappointments.
Start believing in each other either it's the relationship of parent and child or brother sister or friends or anyone ... Expectations never leads you to disappointment but the assumptions are the ones that make you disappointed every time...
For the survival of a relationship you need to believe in each other, trust each other, like each other, love each other.. you have to create an environment of self-reliance, self giving and self gaining as well...
I am not saying give everything to each other, although everyone should respect their selves. I am just saying that life can't be lived alone, you need someone to hold your hand and say yes I am always here for you, that yes I'll stand for you wherever you need, obviously no one is going to give his/her life for yourself and it's not compulsory at all, after all what will you do with his/her body.. you need his/her support and not flesh..
Don't ruin your relationship just by thinking about others.
Don't ask what he/she did for you, infact tell yourself to do something for his/herself. And the efforts you will do for others will make you feel good for yourself and for the peace of your soul ..
Create a moment of love, sacrifice, trust and sampathy ignore assumptions, over expectations and ego..
Remember their is a big difference between self respect and ego.. Maintain your self respect and not ego.. because self respect make you believe yourself and ego makes you believe in yourself only...(yes only makes a difference)