<human>: im 20 years old living in LA, she lives up in Norcal we've been dating  since high school we've had our rough patches but she's never cheated on me before. i come see her at least once a month and was 

planning on seeing her again in a week or two, but now im not sure. 

at first she said it was a peck on the lips but after badgering her i found out it was a 5 second kiss with no tounge. he kissed her passionately. 

the dude is a 26 year old tat artist who i think just wants to get into her pants. 

he drew her a picture of her eyes and she was woo'd she said he payed more attention to her then i do and said that he likes her and that i took her for granted.. 

now i told her that i love her and  want to work it out but is that the right choice? i told her i would

 change for her, but i dont know how long i can look at her without 

thinking about the other guy.

Can you summarize the given text in a few sentences?
<bot>: my girlfriend of 4 years kissed another guy "passionately" told me about it, and i dont know whether or not i should stay with her.