It is not necessarily a turn off to girls if a guy has had a lot of experience with girls.
However, the guy shouldn’t make the mistake of constantly reminding her about it by either continuously flirting with other girls or talking to them while in the process of talking to her.
When you are confronting someone, accusing them of lying, it is a jarring experience that frequently leads to finding yourself in a position where you get ignored.
This is not a confirmation of your suspicions.
It’s a reaction to how you went about confronting the person.
A substantial number of people don’t like confrontation.