husbands not the same.

For the past couple weeks my husband has been so distant. We haven't had sex, he doesn't go to bed the same time as I have, he's on his phone a lot more, I have been through his phone, his Facebook his email I can't find anything that says he's cheating. He just acts like he's lost interest in me and I don't understand why. Like he "forgot" to give me a kiss before he left for work. He kissed our daughter that I was holding but then he just said bye and walked away. I try to talk to him but he tells me he can't talk because he's at work. My stomach is in knots all I want to know is if he's found someone else or if he's just not interested anymore.