history: I was planning on going to a concert last night but I didn't go because I ended up not wanting to go by myself. I feel like I'm going to regret not going. Last night was quite a bummer.
current: I am sorry to hear that. Why was it a bummer?
next: I was planning on going to a concert but ended up not going at the last minute because I didn't want to go by myself. I feel like I'm going to regret not going.