My husband thinks I'm posessive. He thinks that i check his facebook without him knowing. But i never do that.

I hate it when someone blames me for something that i dint do. I dont know how to react. I was so annoyed & angry. I did not talk to him till now. Another problem is we have sex only once in a month..and that too when i ask. this is a serious problem or am I just worrying? we got married 1.5 years back. I don't know what is going on here..please help..I'm really depressed.