Try to spice things up a bit visit
http://www.pjtra.com/t/Qz5DR0dIPkJHR0NJPkNHSEg
and hopefully cheating is not the problem and he is just tired from working all day. Show that you care and dine and unwind him. If he doe'snt respond when you walk in the room with sexual intentions, then take it as a red flag. Keep it in the back of your mind and watch for any other signs.
