I know my husband is cheating
Do you have proof of this?
There are too many signs he's doing it.
I'm sorry that's happening to you.  It's understandable if you feel upset about finding this out.  I hope you get over it soon!
I'm going to put a camera in our bedroom and catch him red-handed.
Are you 100% sure that he is actually cheating? If you put a camera in the bedroom that is such a violation or privacy and distrust. I think it would be better for you to just leave, filming things might cause you more problems and maybe legal action if it ends badly.