Friendship help…

I have two friends (let’s call them A and B, they are friendly but not friends) and I was planning dinners for all 3 of us a few times early 2023, the last on was June 2023. Well the regular dinners eventually fizzled out and we just stopped doing it. January of this year, friend A asked me to dinner, we went and started to make It a regular thing. We have been doing this the last 8 months. Friend B just found out we had dinner tonight, she saw Friend A send me money on Venmo but a few months ago I mentioned I had dinner with friend A so this isn’t new info to her. She asked if me and friend A were doing monthly dinners. I said yes friend A asked me in January and we just tried to keep it up. She asked why she was removed. We haven’t done a dinner with the 3 of us in over a year and friend B hasn’t initiated a dinner. She is hurt and I feel awful because I wasn’t purposely excluding her. I apologized and told her It was never my intention to purposely exclude her. Am I a terrible friend? I feel awful but I also feel like a friendship should work both ways. I am the one always making the plans. Thanks in advance!