NEED HELP!!

Hey girls I need to know what you guys think.

I'm 18 with two kids a son (3y) and a daughter (9m). I live with my husband, But since I moved in with him 3 mouths ago things haven't been the same. But let me give you some back ground on him, he's 20ys old and works from 7am to 5pm everyday for 3weeks strait and has one week off, and works in cement but before this job I used to live with my mom. So this is our first house together. But things ant like they used to be before oh and we have been together since I was 14 .So we have been together for some time now but he used to be very sexually active and always had time for me, He always wanted me to dress up for him and basically I felt loved but things haven't felt like that in a long time we have had our ups and downs like any relationship, but I don't know anymore afterI caught him cheating on me about a year ago I haven't felt the same not about the relationship like I know in my heart I love him, but I'm so insecure now he tells me he loves me send that it was a mistake I'm trying to get over it but he doesn't like to talk about it so I you know I sit there thinking about what I did wrong, like I sit there and wonder is it because of how I look like I dont understand. After I cought him he mad me feel wanted but for a while now like I said in the begging he didn't check me out like he used to our slap my ass poor anything I can walk around the house in a shirt and some sexy undies and I still can't get him to notice me I can layin bed with just my undies on and put my as to him but not even that he just falls asleep believe it or not like 10 seconds after he hits the bed so like I sit here and wonder if he loves me or He's just with me because he doesn't want to see me hurt if he left !! Or if it's because he's tired of work or IDK what do you guys think ?????