A and B were in a long relationship. A was really bad at communication and never criticised B in any way, instead held it all in. Eventually they started having problems and B provoked A into listing all Bs faults. A did this genuinely wanting to change. However a list built up over years is a pretty horrific thing to read. B was extremely upset, felt A didnt or couldn't have loved B for a long time/ ever and ended the relationship.
B met C within days and they started dating. However B still had feelings for A and this caused frequent arguments with C. A couplr of months later A asked to see B - B went with Cs knowledge.
A and B spoke for a long time. A apologised for the list, and asked if a freah start was possible. B agreed. It was left B would end things with C as it wasn't working, and then A and B would take it from there.
B contacted A the next day to say that they'd broken the news to C. B also asked to pick something up from As house later that evening, in 2-3 hours time. A said they would arrange to be home in 2 hours and wait for B.
B then didn't contact A until nearly 5 hours later and said sorry, the discussion with C had bwen difficult and run on and B now wouldn't be coming.
A asked why B couldn't have found a minute in 5 hours to say they would be late, and A said it felt as though their feelings were less important than Cs, it's not nice to be kept waiting etc. A would never have said this in the past - the old A would have just said ok and pretended they didn't care.
Bs response was that A was being unfair and horrible, that B had just spent hours persuading C why B wanted to try again with A, and now A had thrown it all back. That A clearly still didn't care about B and B was wasting their time trying again.
Who is BU?