My girlfriend and I will be together for almost three years. She has had a tough time adjusting to student life and has had to change studies from medicine to psychology. She doesn't have that many friends but she made one very close friend this year. 

This friend is a loose cannon. She is addicted to coke, has cheated on her boyfriend (of 1.5 year) with a girl before (is bisexual). This friend and my girlfriend kissed on at least three occassions while they were drunk and doing coke. I'm not necessarily against coke but this behavior started when she met this friend.
My girlfriend kissed another girl once at a party and I made clear that I do not like her kissing other people (boy/girl).

However, my girlfriend kissed this best friend on three occassions and kept it a secret from me. she only told me about 3 weeks later.I'm having a hard time dealing with this and can't help but feel hurt and betrayed. My girlfriend told me that the kisses didn't mean anything and that its just a girl thing: just a thing dumb drunk girls do. She told me she wouldn't do it again but she wants to keep going out with this girl because it's her only friend in our city.

What should I do reddit? am I being childish and prudish? or Am I getting cheated on? 
She has apologised for it and even cut herself because she felt so bad (she has self harm issues) but now its a week later and it feels like she has already forgotten about it. I, however have not forgotten at all and I feel more alone than ever.
user
Girlfriend kissed her bisexual best friend and kept it a secret from me. Am I right
assistant
My girlfriend and I will be together for almost three years. She has had a tough time adjusting to student life and has had to change studies from medicine to psychology. She doesn't have that many friends but she made one very close friend this year. 

This friend is a loose cannon. She is addicted to coke, has cheated on her boyfriend (of 1.5 year) with a girl before (is bisexual). This friend and my girlfriend kissed on at least three occassions while they were drunk and doing coke. I'm not necessarily against coke but this behavior started when she met this friend.
My girlfriend kissed another girl once at a party and I made clear that I do not like her kissing other people (boy/girl).

However, my girlfriend kissed this best friend on three occassions and kept it a secret from me. she only told me about 3 weeks later.I'm having a hard time dealing with this and can't help but feel hurt and betrayed. My girlfriend told me that the kisses didn't mean anything and that its just a girl thing: just a thing dumb drunk girls do. She told me she wouldn't do it again but she wants to keep going out with this girl because it's her only friend in our city.

What should I do reddit? am I being childish and prudish? or Am I getting cheated on? 
She has apologised for it and even cut herself because she felt so bad (she has self harm issues) but now its a week later and it feels like she has already forgotten about it. I, however have not forgotten at all and I feel more alone than ever.
user
my girlfriend of ~ 3 years kissed her bisexual friend and im hurt. am I childish?
assistant