"Xiao Wei, whether our brother-in-law really loves our sister or not is something we just can't ask about, nor do we have any way to control it. After all, it's a matter between husband and wife. As outsiders, all we can do is to make sure our own family members are not harmed. If because of us, time and again, our family suffers pain and hurt alongside us, then what are we truly doing this to them for?
Some things just aren't meant to be complicated. If our poking around makes everything too complicated, do you think that's good for us? Or put another way, is it something happy and joyful for them?
Actually, you should know that some things we really shouldn't interfere with.