Hearing you talk about a "lack of rewards", I think yes, you should get out of it. Unless you are speaking of emotional rewards...which I hope you are. If that is the case, then perhaps talk candidly with your mother about her minis, and stop showing for a while. If you are getting frazzled with showing/life...guess what, he's going to reflect that in his behaviour around you. Just something to keep in mind.
I suggest...meditation, lots of hot tea and long grooming sessions.
Also, iff you need to "work the crap" out of Cowboy to get him to "stop being a jerk", that tells me there are training issues/miscommunication going on which need to be addressed before adding the stress of a show on top of it all.
Whatever you do, don't act rashly. You may give him up in a surge of emotional passion and then end up really regretting it.