It is like, you say to a person that you are really a nice person I like you and you really mean that from your heart and try to show that to that person. But suddenly something happens, like someother person tells to the person you like that "he is not a man like you think, he always says people that he likes them but the other day he forgets about that and never likes you anymore". Than the person you like asks about that to you and you say я лицемерием не занимаюсь. Which means all the words you told were real and you never lied.
I tried to explain it further.
Best.