I think the only thing you can do is remind her to be careful with her heart, and be really honest with herself about what she wants. I.e. Does she want him, or her, or does she want them both because there is twice the potential to be hurt when there are twice the number of partners.
Anything more than that will risk alienation.
AI: Dave, turn right and walk across the bridge.
Dave : But AI, there is no bridge
AI: I am 99% sure based on 99 billion images that there should be a bridge
Dave: ok , you’re the smart one
Dave: aaaargh . . . .
SPLAT