Well, the fact that he is seeing a therapist is a good start. Don't hitch your star to his wagon though just yet. Therapy takes time and effort, he will find out many things about himself if he really commits to working on himself.
Keep living as you are until such time that his actions show that he is really ready and willing to be in a relationship with you exclusively. This of course, is contingent upon if you want him back and both of you are willing to do the work to ... make it work.
Right now, he is just feeling things out. This is normal. You have to maintain your boundaries and life if there is ever to be any semblance of a new relationship between the two of you.