The most important thing is for someone to stay faithful. If someone does lie I feel as if my love for them isn't reciprocated and that is the worst feeling ever. To be so widely in love with some and not be loved back.
Commitment is something people find difficult but it is one of the main factors that secure your love @surfermarly! :)
In my opinion you can't ever ask anybody to love you back. But you can ask him/her to be honest.