I think that mian siorai is on to something. How accurate do you find the following:

You have feelings for him. First he seemed to minimize them by pointing to the age difference. Next you come to find out that pointing to the age difference isn't just dismissive, it is actually disingenuous. No wonder you are angry! No wonder therapy is stuck.

What if you approached him in anger and indignation, rather than apologetically? On this approach, you would want to find out why he decided to mislead you rather than to explore the feelings as professionalism would require.