<human>: Long story short, one day me and my girlfriend plan to meet, and she comes to work obviously in last nights clothes, she reeks, and looks like shit. She tells me a lot of bullshit and starts making out with me, but even in the moment i don't buy it. Later that day, she uploads some pictures to facebook that she tries deleting before i see them. I have previously received a message clearly adressed to her ex boyfriend telling him he is an idiot and some things about love, it was very ambigious without the context.

The pictures she uploaded does not show the driver, but i know that the car is her ex boyfriends.

On her birthday i call her, she's in bed, claims the signal is bad, and giggling. I tell her to not hang up so i can dump her right gere, but she does.

Next up i meet her tuesday, the day after her birthday, she was in her hometown celebrating her birthday, and could not bring me because of whatever, the point is that she claims she came back the day after her day, but a friend of hers uploaded a picture of her celebrating birthday in the same town as me. Her friend deleted me from facebook and later readded me claiming it was a mistake, her mistake was not knowing that i could see the pictures anyway.

Either way, my girlfriend has now been out with a 'friend' although she told me she did not have time for me, while kissing me on the lips and claiming she would spent all her summer vacation with me.

I am dumping her tonight, it will be very hurtful because we have had an amazing relationship. But I need closure, she's very transparently cheating on me, and I want our relationship or friendship to end before i sink with it.

Can you summarize the given text in a few sentences?
<bot>: almost certainly cheating girlfriend, I need to escape her lies. How do i keep my cool and make her feel bad while admitting the truth.