I did find this bug once and i'm pretty sure it's a bug.
You have ASP which is Erynn trying to set you up with Alexis, but Erynn is still making out with you, it does feel weird and lack cohesion... probably because it was never intended.
ASP isn't suppoused to happen with the Erynn route, it's suppoused to be an Erynn who is no longer interested on the MC for herself so she decides to set him up with Alexis.
It's probably gonna be fixed come version 15 since Layla and Erynn won't be able to be combined anymore.
So far there have been no conflicts between Nikki(same applies to Cara) and any of the girls that live in Madison Springs.
No one has the right answer to this question... is there a final decision coming? Are you already screwed? No one knows... (also saves are getting dumped so who cares?).
PS:
Kaskaze has the right idea, play the game, spread some saves around to be safe(reload if you fuck up too much) and have fun, stop thinking on how you can beat the system.