That is so important. Love is never deceitful. It isn't deceitful to your spouse. And it isn't deceitful to your children. If there is deceit in a relationship, it is not true love, rather it is self-serving and selfish for personal gain.
Never trust a person who has let you down more than 2 times. Once was a warning, twice was a lesson and 3 times is simply taking advantage. Gotta remember this! Why waste time with a person who isn't a.friend at all?