I can't say my W has driven the crazy train, as she has not "ran" like so many other MLC'ers have. She talked about doing it, even commented that she's surprised she hasn't... but she's still pretty much here and present.
But fear is a major driver. Fear of missing out on life. Fear of time running out. Fear of not finding "passion".
The low self esteem, social anxiety MLC'er seems to be the opposite of the narcissist MLC'er. Ask me how I know!
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl