Out of nowhere her guy friend asks my gf for almost no reason if 

they're "gonna cuddle," my gf asks "your gf is ok with that?" and he

says "only if you're ok," she says "thats not what i asked :p" then he

 said something else, i forget, but she responded "idk... we'll see." to 

the cuddling question. they hangout that night, along with her girl friend and her other guy friend.

then the day after the guy's texting my gf that "it was just a hook up."

 and my gf is saying that "i can't cheat on someone i really care about."

 and how it's wrong what he did and how they shouldn't hang out, and 

it's also partly her fault. Around this day my gf told me he had tried to make a move on her but she had rejected him (the lie. She told me after i had read the text messages that she was worried i would break up with her for that)

then i look at her friends text messages and she's telling her that 

he's(the guy who kissed her) is really gross, and that he was a bad 

kisser and that he must be bad in bed.

i told her i saw the texts and she began crying and started telling me

 what really happened... and how she wouldn't have cuddled with him 

because that's not cool and crossing the border and how he was the 

one who kissed her but that she backed off right away, and that right 

after she regretted not backing away before it happened. When i asked her if she was ever gonna tell me she said she was, that she felt remorseful.
user
gf lied and kissed another guy, she says she regrets it and that she was wrong for what happened. She also says she's never gonna tell me she lied about it. She also says she feels remorseful even if she didn't do anything wrong. She also says she's never gonna tell me she
assistant
Out of nowhere her guy friend asks my gf for almost no reason if 

they're "gonna cuddle," my gf asks "your gf is ok with that?" and he

says "only if you're ok," she says "thats not what i asked :p" then he

 said something else, i forget, but she responded "idk... we'll see." to 

the cuddling question. they hangout that night, along with her girl friend and her other guy friend.

then the day after the guy's texting my gf that "it was just a hook up."

 and my gf is saying that "i can't cheat on someone i really care about."

 and how it's wrong what he did and how they shouldn't hang out, and 

it's also partly her fault. Around this day my gf told me he had tried to make a move on her but she had rejected him (the lie. She told me after i had read the text messages that she was worried i would break up with her for that)

then i look at her friends text messages and she's telling her that 

he's(the guy who kissed her) is really gross, and that he was a bad 

kisser and that he must be bad in bed.

i told her i saw the texts and she began crying and started telling me

 what really happened... and how she wouldn't have cuddled with him 

because that's not cool and crossing the border and how he was the 

one who kissed her but that she backed off right away, and that right 

after she regretted not backing away before it happened. When i asked her if she was ever gonna tell me she said she was, that she felt remorseful.
user
So, according to the texts the guy kissed my gf when her friend and the other guy were gone. But she quickly rejected him right after. I don't think i should leave her, unless it happens again. we had gotten into a pretty bad fight the day before(the fight had nothing to do
assistant