Hi Ameline. Sorry you are feeling so emotionally drained. It is not easy confronting our past when triggers bring it to the fore.
At least you can talk to your ex and he is caring enough to take you for tea. Have you considered talking to a therapist about your relationship or about your ADHD?
Many people here at PC find they can share these feelings and what they are going through with the confidence that people go through similar things and can empathize. So many forums are offered as well as Chatrooms (after you have 5 posts or comments on others posts). Depression chat meets on Thursday night at 9pm EST and Anxiety Friday at 8PM.
You can also be an active member in other ways like supporting others in their questions, reading articles and posts
http://forums.psychcentral.com that are applicable to your area of concern.
Please feel free to private message me or any of the Community Liaisons by left clicking on the name in blue to the left of their post) for questions or just to share.