Sister-in-law has a deadline
My wife's sister (36F) has been with her boyfriend for 2 years. She has this deadline next month where if the guy (35M) does not propose to her next month she would end things with him. Mainly for biological and birth reasons which is understandable since the fertility of a woman decreases and childbirth hardship increases as they get older. However, my problem is the guy. He is a good guy and they're a perfect match in every way. We already also have developed this brotherly bond. He does not know that there is a deadline. Should I tell him? I know it's not my business but they're both a good match.
Three things would happen:
He would prepare for next month to propose
He would get scared and end things right away
He would get hurt because of the deadline and either end things right away or try to compromise
My guess is 3.
But what are your thoughts?