I realize this probably cannot be helped, so I was hoping there was a way to delete those unneeded relationships and memories from my sim's relationship panel and memories panel.
SimPE? It's really easy, trust me.
(And on a side note, is there a way to make your game more like real time, meaning a lot slower, without slowing down your sims as well? So they would be at normal speed but their needs and/or the time of day would be slower?)
There are plenty of motive-decay hacks and cheats out there, and I'm pretty sure there are some that change the time of day, too.