I don't think it had anything to do with a previous boyfriend but she said she was bored, was not happy, said she was not content and didn't love me any more. So if there is such a thing as a MLC she would fit the category. We had never talked or discussed D before and then 1 day out of blue says she is done and 3 weeks later moved out.
My wife said the very exact things that you mentioned above - bored, was not happy, said she was not content and worse never loved me since marriage! Also woman have this weird thoughts , where they have decided this fact years before and still live with you as if nothing happened. And when the day BD is dropped, you are in shock. For them its a long gone thing. Unfortunately that is what happened in your stitch and some others like mine triggered by an external source like family fights etc.
M(35) F(35) T(6) M(6) BD 10/25/2017 S 3/12/2018 LRT 4/3 D Served 4/30 D Signed (Me) 5/1 D filed with Court 5/21 D Final 7/6 Moving on with life and doing lot of GAL since 7/6 :-)