I have a question about betrothals.

When I arrange a betrothal, I don't get a event or anything when the two person get to sixteen. I had to break betrothals because both caracter were in their 20's and nothing would happen. Most of the time I would just make a marriage offer and they would accept but I would still get a -25 or something for broken betrothal. Any advice?

Sorry for my spelling mistakes, english ain't my first language.