I would agree with the others about continuing to read those emails. OW did get in W's head but it was still W's choice to pursue her. I do the same and focus on OM (just a week or so ago, lol) it just causes me to ruminate on them. Even if I learn a little about how much of a POS OM is, how does that really help me? It just keeps me attached and stops me from moving forward with my own issues and life.
Its great you got some time away and were able to have some fun. You are right about detaching and letting go, its a process that takes time and we can either delay that significantly or allow it to progress at its own natural rate. Time will get us through this, keep being awesome and you will be fine
Accept what is, let go of what was, and have faith in what will be