I'm actually having issues with this in 0.13. I've disabled relationships with everyone as far back as mid Melody's first time, and left it there throughout till the end of the next date with Becca. I don't get the breakup talk when she gets there in the morning, but I do get the break up date in the evening and I don't know how to stop it. I've looked at the written walkthrough and it says that Melody and Amy's relationships have to be disabled before the start of week 10, but I think the mod turns off the calendar so I don't know when that is, and I think I just had to disable it before the date in previous patches, but I'm don't remember which patch or if I'm right.