Sunrise, my t used to do this too and she explained to me that she is acting the part of the devil's advocate. At first I resented her for it, also had these ups and downs...today you're my ally....today you're not....when I developed enough trust in myself I was able to handle the devil's advocate part of her....I think cuz I used to entrust her with all the decision-making and expected her to lead me down the right path....I eventually learned to appreciate when she played devil's advocate...she's still my ally and as my ally she's pointing out the risks....
IMO if your dh comes in for any kind of counseling with this t you may start to feel this is no longer 'your' space....there are definitely risks involved...I know I did it and the benefit was that t saw first hand what kind of bs I had to contend with on a daily basis....but in working on the marriage I felt she was not aligning herself with me, rather with the 'marriage' and there was a definite conflict of interests.
I think it depends on the individual issues involved....consider carefully....share with us if you'd like....
Take gentle care,