Loved One is Recently Diagnosed and Embarrassed
You may want to consider having an open relationship with your loved one. You can share with them that you have noticed they get embarrassed when they forget things, and they aren’t as open to doing the things you used to do together. They might be appreciative if you ask them the best way you can provide support when they are forgetting something.
For example, together you can come up with gentle ways to cue them so that they don’t feel embarrassed or exposed if they forget something.
Also, suggest that the two of you have ongoing check-in conversations to see if there are other things that might be helpful.