3. People with ADHD have difficulty knowing or remembering relevant boundaries in relationships. It is much harder to have a good relationship with someone if you forget or don't realize (or impulsively ignore) that you don't want to share certain personal information with them. Also related to this is the fact that not everyone needs to know everything about us and we don't have to connect on every level to everyone. It is ok to make distinctions based on the kind of relationship. This makes it a lot easier to like people and for them to connect to you without either person being overwhelmed.
I feel like there is a lot more to say here, but these are some of the points that have come up a lot in my coaching work. It is possible to have good relationships when we don't expect them all to work the same way and we have some good self-awareness in our social lives.