I need your wise advice on this matter:

my gf is probably starting the annulment process next month, she has already met her husband and he even seems to be keen to pay half of it!
But he wouldn't like to be the "psychologically incapacitated" one.
Actually, she left the family house (because of his infidelity), so he may have better grounds to file than her.
But as we know, a good psychiatrist and a good lawyer can make miracles.

We have to make a decision: let him file the annulment and have the control of the whole process (of course she wouldn't oppose)? or she'd better to keep the control and file (and in this case he may oppose and maybe refuse to pay, because he doesn't want to be defined psychologically incapacitated)?

I know that a consentient husband may be quite a rare and lucky case, but it may not be as good as it seems... Any experience or advice?

Thanks