My oldest is graduating from Uni in a few weeks. The graduations have been set up completely differently since COVID and families are allowed two tickets. DH has a ticket because he works for the university. So I have two tickets. We had determined that one of my other sons was going to attend with me. Well, my son just texted and said "If you haven't already promised the ticket can Sally go with you to graduation?" I responded that my other son was using it and he responded "OK, that's fine". Now I', feeling guilty that I'm not giving the ticket to the girlfriend. AIBU?