Well, I know it's hard to tell a friend or family member that they might be rushing into things & all they need to do is slow it down a bit...and really get to know the person...
Believe me - we tried to tell my brothers that a couple of times and they are both on marriages #3 and those are on shaky ground...
It stinks , ya just get used to a sis in law and then ppfffttt!

on another topic-
It's so weird , lent my nice computer mouse to dd and used a spare one for a day then we went and bought 2 new ones so we'd have a backup if the other one stops working.
Glad she gave my old one back , just using those other kind for a short times made my right arm/shoulder start aching.
same brand but designed just a bit different.