It sounds to me like he's trying to soften the blow of "leaving you" by inviting you to these events. Like he's trying to show you that it's not personal - that he's not abandoning you - that it's not that he doesn't like you. Since he said he's happy to receive texts from you, why not use that opportunity to get some help with this, or some closure to the professional relationship. Why not tell him that you're having a tough time with this, and feeling overwhelmed. Ask him if he has any suggestions on how you can cope with this. Maybe just sending the text would help a little? I don't know your history with this T, so these are just my thoughts. I really hope you can find some way to feel better about this.