welcome to married life lol!
Try taking to him about sex, what u like, what does he like, fantasy's...Tell him when he holds u in a way u like how much u like it. Ask him what type of affection u give him dose he like? Start taking about sex. Watch porn together@! I never thought i would say that! But things do get stale and its good to get some ideas for u to both try and have fun with...
Surprise him, get someone to mind the kids for the night and make a romantic dinner, dress up (formal or in sexy underwear), light candles - when was the last time the two of u had a date together?
I agree with PP don't cheat. Talk, counselling, if that fails then move on.
Good luck