Every time I've ever seen 'reverse-netorare' used, it has meant the male partner cheating on his female partner (she being the MC). Which makes sense in the context of netorare almost always being a man being cheated on. The reverse of that is a woman being cheated on. However it is not as you are saying just "cheating", it's specifically saying something about the perspective of the protagonist who is being cheated on in either case; netorare = male, reverse-ntr = female. In that sense cheating as a tag goes along with ntr or reverse-ntr but isn't the same thing. At least that's my view of things.
Uhhhh... the terms aren't gendered, reverse is when it is MC being cheated on.
Netori and Reverse-NTR require an MC, otherwise it is just NTR.
Just that most games are Male protag, and that it is typically cared about most when it is a male protag as well. So I get the reason for the idea of it being gendered, but it isn't.
Like... refer to the previous comment.
Netorare = MC being cheating on. Literally meaning (as in what the word means in english) "To be taken from".
Netori = MC stealing from someone. Literally meaning "To take from."
Reverse-NTR = the reverse of "To be taken from" which is "To be taken by". (technically Netori is also a reversion, but since it has it's own term, Reverse-NTR does not include it).
But yeah... the terms have nothing to do with gender, as the japanese of it does not contain any gendered terminology at all.
I suggest reading the spoilered content if you want to know more about the root of the words.