Regardless of the situation and different circumstances, whether it be me that has left or the relationship has just fallen apart. I analyse it to death over a few months, or longer, if the relationship was longer. This, to help me build myself up and be a stronger person, I can be very weak in the beginning but as time goes on, I recognise the reasons it didn't/hasn't worked out and that makes it more definite to me.
Memories haunt me though, special places or days of significant in the relationship never go away and can send me thinking back...but not for long, just fleetingly.
