Good to hear about the GALing and having a trip to look forward to and can certainly help as I well know. Keep focusing on those things and less on the W.
I don't know anything about divorce law, but it sure sounds to me like you should speak to a knowledgeable attorney soon. That doesn't mean you have to file, but they can advise you of your rights and obligations. Continuing to pay your wife so that she can lead this single life seems like pure NGS to me. She won't come back because you are nice to her. As long as you keep supporting her like this your actions are telling her that you are still attached, that you aren't moving on, no matter what your words say.
And don't reimburse her for anything. That's her life, her problems, not yours.
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019