If you need more advice, here it comes: do treat her as a human being, with respect. Do not interrogate her and demand her honesty. You are neither her creditor nor her manager so she does not owe you reports on her private life, and her r/s with the oother guy is her prrivate life to which she has a right being a free human being in a modern society. Drop the topic of the other guy altogether, unless she brings it up on her own volition. Next time you see her, tell her what you told us, that she is beautiful etc. That cannot hurt.