^^^ It was a wise move. Mixing business and family in the best of times and in a legitimate business is difficult and problematic enough. In Jax's business it can be very deadly and used against him, particularly now since he's now interacting with an adversary who is known to turn family members into charcoal to prove a point.
Gemma will never see it this way, but Jax really is trying to protect her the best he can. She just seems to be acting like a petulant teenager this season - Clay, too - now that their power and comfortable influence has been forcibly stripped from them.