To be honest I think you may be opening yourself up to a lot of hurt by just letting him move back. As a minimum I would recommend several sessions of MC before hand. A MC can assess if you two are ready to try again. You can also date during this period. The dating is to reconnect.
Him moving in then out yet again if things do not work out will be very painful. Protect yourself. It is good he is in IC and he feels he needs time. But you need time too. The MC can also explore your end of the story. Remember a R involves two people. Sometimes a PA is a symptom of a larger problem he sees in the M (true or not) that he may feel you are responsible for or should have to helped fix but did not.
