(1) You don't need to repeat the boundary, you need to enforce it. "H, it is not OK with me for you to be involved with PW outside of the office. If this continues, then I will be very hurt that you are risking the health of our M and an exciting chance we both have to build a wonderful M for PW. For me, this will certainly undermine our M, and I am scared that I will quit wanting to be in it with you."
(2) Can you check in on Donna? I won't be around much and she is having a tough time. H has been lying about PW again (uggghhh, gut punch).