Lost interest.

Ok so just reasontly I have lost all interest in sex. Period. Like I don't even want to be kissed.

My SO assumes I'm mad at him and that there is something wrong. Which there isn't I just don't have the urge to be sexual.

He tries. But fails- Horribly and then gets mad and by his own choice sleeps on the couch.

Has this ever happened to you before?

What did you do to cure it?