boyfriend says he feels unable to care about things

Edit to add: it’s not that he’s not caring, he just doesn’t see that he is and doesn’t feel that he is. I see the ways he cares for me, and the people around us but I don’t know how to make him realize it. My emotions are very high so I know they are hard to deal with, I go to therapy myself because they’re just too much lol

my bf of 2 years has struggled our entire relationship (as well as his previous ones) with the emotion in caring. Which plays a toll on our relationship as I am a very sensitive person that has a lot of emotions that I like to open up about. He’s tried in person and online therapy, nothing seems to help and he has been diagnosed with adhd, not sure if that plays a role or not but maybe? He’s not on meds, he’s scared to take them from previous experiences with medication.

It’s not that he doesn’t care about me, he just can’t handle my emotions long story short. Which is hard for me to handle because I want to open up to him and I also want him to open up to me fully.

There is nobody else I can imagine being with and a life without him in it seems unimaginable all together, there’s nobody I’ve cared more, loved more or done more with and I would like to keep experiencing life with him so I guess what I’m asking is is there anything I can do to help, move past or deal with this? Has anyone dealt with similar situations with loved ones? I just don’t know what to do