I had the same experience with my "i dont know what he is anymore" bull. His wife divorced him after 20 years around 3 years ago. We were friends on and off even before his divorce.. Then became more than friends...He was very opened with me about his divorce, which is what i think your bull was/is doing by talking about his ex's. At the same time, i felt like he was comparing me to her and i felt like he was not over her either. These taurus guys HATE change and love routine. When their ego gets stomped on especially after being cheating on, it takes major time to heal. Right now my bull needs his time, and i am giving it to him. It sux BIG TIME, not gonna lie... You need to do the same thing too. Dont push or jump the gun with any decision. Live your life. When the convo starts heading to the ex, guide it to other things. Things will work out for you, one way or another. Hang in there and completely go with your gut feelings.
I hope my bull finds and makes his way back into my life. I would rather be a Ms. Right than Ms. Right Now. Just hope he makes his way back before i meet someone else. LOL. I guess we will see what they are made of when they smarten up and get over themselves..LOL
Take care and good luck!!