Dear jamccor,
It can be very difficult to walk according to Christian principles if your wife is not saved. However it sounds like you are blessed with a wife who lets most things slide off her back instead of holding a grudge. This is something to be thankful for in your heart.
I would say that you must take the lead and not bicker. Two hands clapping can't make a noise if one doesn't move. The answer is to speak the truth in love and leave it at that, refusing to get into arguments. You are the husband and set the climate in your home. Forgive and forget. If you can't, ask God who will enable you to. God keeps no record of wrongs, niether should you. Shake it off. Don't let the sun go down on your anger:
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Eph 4:25 ¶ Wherefore putting away lying, speak every man truth with his neighbour: for we are members one of another.
Eph 4:26 Be ye angry, and sin not: let not the sun go down upon your wrath:
Eph 4:27 Neither give place to the devil.
Eph 4:28 Let him that stole steal no more: but rather let him labour, working with [his] hands the thing which is good, that he may have to give to him that needeth.
Eph 4:29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
Eph 4:30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
Eph 4:31 Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:
Eph 4:32 And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.
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If there are issues your wife has about you that are reasonable try to be a peace maker:
Pick up your dirty clothes
Remember to tell her you love her and give gifts on days that mean something to her
Turn off the game if it really bothers her
Don't spend money that you shouldn't. Come to agreement in this area. You don't really need the latest ipod or video game, you just want it.
Don't humiliate her in front of people, build her up and let folks know she is more special than all the rest.
Don't point out her fat or a zit. Tell her she is beautiful, however if she is gaining a bit of weight lovingly let her know you both need to take care of your health because you want to live a long life with her.
I know this sounds like a lot of one sided stuff but it only takes one to make a start. When we are living a crucified life we will lay our life down for those we love and when she finally gives her life to Jesus, she will lay her life down for you. You must be the initiator of better things.
I could list a thousand other things that might bother a woman because I have experienced them all and failed until Jesus taught me about crucifixtion. However you know her deal. You know the things that she complains about. See if you can't love her even if you hate to watch Pride and Prejudice. Death to self is contagious. When she sees the beauty in you she will know that what you preach is real. Go for it brother.