When he confuses you with the side piece - not by name, but by actions.

side piece. other woman. her! or him! mistress. side chick. best friend. affair.   (Risking the incorrect use of grammatical sentence structure, I didn't dare capitalize any of those words)

Generally, you would think a cheater would hide the other woman and not let her know where he engages in social, spiritual or family events for fear that she might appear and put him under pressure of the lies he's told her about kicking his family to the side and bringing her fully into his life. What the nut does is he treats you - his Wife - that way. He sneaks to do whatever he does - social fellowship, church, entertainment, ministry, and  volunteerism. Yet, the side piece knows his whereabouts and is often included, which is what you would think he would do with his wife. You, Wifey, find out when you see the pictures of the gatherings and events or acquaintances question you as to why you weren't "there".  "There, where? I didn't know about it."  But, she did and was there, too.

Proverbs 5- 15 "Drink waters out of thine own cistern, and running waters out of thine own well."  Just read the whole chapter.
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Pictures! You would think that a husband would take pictures, candid shots or posed, of or with his wife and kids. But your smart husband takes pictures of side chick, smiling, having fun, enjoying life...not in a group of other people, but individual pictures of her.  So deceived.   

Song of Solomon 7:10 - "I am my beloved's, and his desire is toward me."
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When you two are (amazingly) together at an event, whether he knows others there or not, he acts like he doesn't know you. He has so convinced people that he does not like you and has spoken against you so many times, that he has to remember to act like he doesn't like you in front of the people to whom he's disparaged you. Stupid (having or showing a great lack of intelligence or common sense). Why?  He got out of the car with you, wears the wedding ring you gave him, goes home with you, pays the bills you two make together, but IS convinced that if he doesn't talk to you or avoids being around you in the presence of others at events (and even church), then they will be convinced that he isn't married to you.  Yet, he and the side chick always have something to laugh and sniggle and coo about. 

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He and the side piece actually think they are more "saved" and Christian than you - the WIFE.  The MARRIED man and his girlfrIend actually think God prefers them over his MARRIED self and his WIFE. 

Deuteronomy 11:16 - "Take heed to yourselves, that your heart be not deceived, and ye turn aside, and serve other gods, and worship them;"     A few years ago, I did a TPM teaching how we do but should not worship our feelings and emotions.  We should not make a god of our feelings and emotions.  Live holy.  Stick with the one your with.  Don't be a cheater. Don't suffer the mistreatment of a cheater and that goes for the Wife and the side piece.

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By the way, how often do humans do the same with God and our relationship with Him?  So we not invite Him to certain places?  Do we act like we don't know Him around certain people? After treating Him as if we don't know Him, we rush to Him in times of need or privacy.  Are we humans cheaters, double-minded, unstable about Jesus in our lives.  Hmmmm. Peter said he didn't know the man.
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Luke 22:54-62 Peter said about Jesus    57'...I know him not."   58 "...I am not."   60 ".. Man, I know not..."