I don't think it's a before/after the split that causes it. It's the realisation it's not all rainbows and unicorns. My Ex was lucid at BD but her comprehension definitely took a nose dive once I grew a pair.

Btw the Ex is very unhappy at the mo. They say they notice out changes? Well it works both ways.

Me:43 Her:42
M:14
S:9
EA started 2014/03 (or there abouts)
PA started 2014/05/30
BD:2014/11/05
I left 2015/10/01
I returned 2015/05/02
She left 2015/06/10
OM still on the go.