How you respond can depend on the context and your relationship with the person, but here are some general suggestions:
Stay Calm and Understanding: Don't jump to conclusions or assume the worst. There could be valid reasons for their absence, such as an emergency or unexpected circumstance.
Reach Out: If you're concerned about their absence, consider reaching out to them through a call or message. Politely ask if everything is okay and if there's a reason they couldn't make it.
Be Open-Minded: Give them the benefit of the doubt. Sometimes things come up that are beyond their control, and they might genuinely feel bad about not being able to attend.
Express Your Feelings: If you had been looking forward to their presence, you can let them know that you missed them at the party in a non-confrontational manner.
Avoid Being Accusatory: It's essential to be understanding and not make them feel guilty for not coming. Making someone feel bad about a situation they might not have control over won't be helpful.
Consider Their Perspective: People have their reasons for not showing up, and it's essential to consider their perspective as well. Avoid making assumptions about their motives.
Plan for the Future: If they provide a valid explanation and express regret for not attending, you can discuss the possibility of meeting up another time or inviting them to future events.
Let It Go: If they don't provide an explanation or seem disinterested, it might be best to accept it and move on without holding any grudges.
Assess the Pattern: If this is a recurring behavior, you might want to have a conversation with the person at a later time to understand if there are underlying issues or if your expectations need adjustment.
Remember, every situation is different, and it's essential to be understanding and open in your approach. People have their reasons for behaving the way they do, and it's important to respect that while also expressing your feelings if needed.