Cleaner I can understand the question, but I have to say the word "let" disturbs me (divorce sitch and all).
The way that I view it, if one can not trust their sig other to make decisions that would NOT intentionally "hurt" their relationship then I do not believe that the two should be together. Ultimately, she must decide for herself. If she is not free to make decisions such as this WITHOUT fearing that it may "piss him off" she will grow to resent him and hate herself for not being aloud to decide for herself. What he does as a result of her decision is another matter altogether. If he can not stand by her and support her, then again, maybe they should not be together....he should voice this to her because of the possible longterm ramifications of such behaviour, but it should not be what she bases her decision on.