My Boyfriend won't have sex with me

It's been about 2 weeks now and he doesn't cuddle or try anything. I've asked him about it and he just says because I'm always mad at him, wth, im NEVER mad!!. He uses that excuse for many things, I don't get it. Also he can't be watching porn or anything because we have all the phones and computers on an accountability app. So I just don't know what to think. I know 2 weeks doesn't seem that long but before that one time it had been 3 weeks. So this is rare. 
Then I start thinking he's cheating or something at work, you just never know. 
What I do know is I feel so unloved, I am a stay at home mom and I need some adult attention and his excuse of me always mad at him is a cop out and NOT true :,( 
What do you thinks going on?