Starting to think it's me....

My husband and I use to have sex all the time. At least once a day and he could easily last an hour or more. In fact he has to have at the very very least 15-20 minutes. Well now we hardly every have sex. We get to the bedroom and things seem like they are going to get hot and heavy and then the mood just vanishes. It's like he looses interest and would rather just sleep. The rare times we actually do have sex it's kind of boring for both of us, even with trying new things. He rushes it now too. He finishes as fast as he can is what it seems like. I normally don't get off and after he is done he rolls over and goes to sleep. I have been in a pretty bad way lately. My depression has really taken hold and I'm struggling, anger issues has come with that, but mostly that is with my animals and not him. I'm starting to think he has lost interest in me and doesn't want me anymore.... Would you agree that it's me causing the friction??