Have you ever been in a relationship where you thought you were going to get married, but it didn't work out? What happened?
(ETA: You can replace "get married" with "be together forever." if that suits your situation.)
I have had like four of those, but mostly I was like 16 and ~*~in love~*~ so it didn't count. Once I was in a relationship for 18 months that I really thought was going somewhere, but then he turned all religious on me. He had been religious the whole time, but I guess he finally gave up hope that I would ever convert, or something. Funny thing is, he had been straightedge and as soon as he dumped me he started doing a lot of drugs.