The OP said he hasn't been cheated on and he is not worried about that. Of course he can find himself another girlfriend. But maybe he loves this one.She also has kissed this person.
So what?... so maybe OP wants to date a woman who doesn't kiss her friends or deal with insecurities by exchanging full nudes with others.
If that's her tendency imagine how she might handle insecurities down the line.
OP can definitely find a different girlfriend who does not kiss in a sexual way her close girlfriends or exchange full nudes because "insecurities".