What to do.....

I don't what to do anymore, I feel so childish feeling like this.... But I've known my husband for 6 yrs now and we've been together for 4 years and we just got married in June 6, 2015. I have 3 kids and they love him and he always says they are HIS kids...anyways:
 When we didn't live together we would have sex every night. We moved in together and we would have sex every other night. And then we would have sex 2 times a week and it's been decreasing now we have sex 2-3 times a month! Lately it's like he's not even interested in having sex with me. I know he would not cheat on me as he's had a pretty fucked up relationships but I feel neglected I mean I can wear sexy lingerie or just be plain  naked and he will feel me up and before I know it he is snoring! It makes me feel so bad!! I feel so shitty! Idk what to do... Am I being childish for being upset for not getting laid?? I mean when we DO have sex he does make sure I am fully satisfied and we do get pretty kinky but idk what's going on now all he wants to do is sleep ughh I got so mad at him that I told him someone else can satisfy me! I won't cheat on him so that's really off the table but I do want to go back to having sex a lot more often...any advice ladies?