Most Helpful Guy
Nope, just because he is rooting for her it's still not enough evidence. It's not a video of them kissing, holding hands, making out, etc. If you're worried about him cheating then you may need to step up you game. You have to do everything you can to ensure he'll be loyal to you and interested in you only and not anybody else.
Most Helpful Girl
First of all if he doesn't like it why are you doing it? You are invading his privacy. Second, no it isn't cheating.