Obsessional efforts to think of options(“ruminative flooding”)
when no options seem available leads to frantic, panicked searching, and infinitely spiking stress- a perfect situation for suicide to arrive as a dark and solitary possibility.
If he is telling you that you are crazy, or gaslighting you by telling you that you really didn't see him do what you think he did, or that the problems of the relationship are because of you- those statements said to you when you are suggestible stay filed in your subconscious and are replayed over and over again,
creating intrusive thoughts and Obsessional thinking.