Hey Nina, it almost sounds like that friend would rather do 1-on-1 with you. Are they uncomfortable around people/do you think he/she doesn't like that particular group? That being said people get more busy more quickly as they get older. Very hard to make plans so I wouldn't take it personally. It's mostly just close fam for me now sometimes friends but I have to remind then months ahead and keep on them every week Happy B-day in advance!