Daniel_

You said at the start you were not sure if she has a BF so you were interested.

You said later that you are pretty sure she does have a boyfriend.

In my experience, a girl who will cheat on her boyfriend with you will cheat on you with someone else.

Walk away, sir, and save yourself pain and getting a reputation that will last in any college for being "the bloke who broke up X and Y" which could well lead to no woman wanting you.

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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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