I am still on the outside of my Sitch. looking in but I will give you my thoughts and how I would approach what is going on for you.
If you have been "DBing" and your husband has seen the changes in you and decided to come home that is very good.
You need to keep on DBing, keep doind the things that have made him decide to "try"... the first bit of time that he comes back home is going to test both of you he will be looking to see if you are "REALLY" changed and you will still be feeling tons of insecurity.
Remember NO EXPECTATIONS - otherwise you will set yourself up for hurt and dissapointment.
Take each day, each moment as it comes and make the best of it.
You need to make yourself more attractive to him then the OW - no pressure, no R. Talks no Temp Checks, just listen to him and validate.
You are right the choice MUST come from him... pressure will push him away.