If they told you things they never meant or when they promise you things they never do, and when they make you confused about almost everything, and make you stuck with their lies.
Follow your heart, your feelings, you'll know better.
by asking this question i know you're not sure and having doubts, so from the beginning don't get your self into things you know or even doubt they will hurt you or cause you any harm. it's only my opinion and i could be wrong. but no matter what just follow your heart.
hope i could help...
When they 'drop hints' about something they want you to do/give/etc to them, and you do precisely as they hinted, then they say (usually 'most innocently') "But why did you think I wanted that?" Someone who lead you up the proverbial garden path like this is NOT WORTH IT.
Also: When they savage something about you, THEN PRAISE PRECISELY THAT THING IN SOMEONE ELSE. Do not endure double standards. Someone who indulges in DOUBLE STANDARDS is NOT WORTH IT.