I think Hook should sit Emma down and tell her what happened. She, or Regina might be able to remove the curse. Besides, keeping her magic or having him should be her decision. Not his.
I think he wanted to talk to Charming about it before broaching the subject with Emma- because he is so thoroughly ashamed of his actions in EF. I think in his mind he feels he hasnt just let himself down, he’s dishonored Emma as well & that is why he’s not come right out & spelled out what has happened to Emma yet- he’s afraid his actions in a moment of weakness, will cost him Emma for good (not that it will, but that is probably his head space atm).
I fully believe he went to Snowing’s place to tell if not both of them what just happened, at least Charming & to sort out how best to go about telling Emma of his epic failure as a person worthy of her love (in his own eyes). The only reason he stayed was Emma wanted answers to her question or he would have left & waited until later to find Charming/Snowing.