Caught my girlfriend

Just recently went back to college and met a girl I started dating named Stacy very nice body curvy gets lots of art she’s into dancing so her ass and legs are beyond hot. She resembles Julia Stiles to the “T” guys are always checking her out hitting on her. One night at a bar i noticed her smiling checking another guy out. It caught me off guard since she’s never flirted back with anyone. She disappeared for a little while and it didn’t hit me til later how everything came to be. She just came out saying she was going to head back to her place she was tired. I didn’t think much of it and she says she’ll see me the following day. Something didn’t seem right so I just had a few more. Then i decided I need to check on her so I left went to her place and just recently given the keys upon going in I heard music smelt the aroma of weed which really had me concerned me thinking she might be showering but she wasn’t . Soon I heard the sounds of talking then as I waited the sounds of her moaning groans got louder the bed squeaking I couldn’t hold back I was shocked to see what I saw. My so called girlfriend was on bed on all fours the black guy she had been smiling back and forth was behind her full force pumping her from behind she looked at the light from my phone she was surprised shocked trying to get me to believe it wasn’t what it looked like. Here’s my delimma she is so hot sexy and I never thought she would cheat on me . I want to give her a second chance but listening to her describe to him how good he felt it felt moaning I could never compare or compete with that . Things would never be the same. Who’s to say she just is into the Thug type bad boy type and is just very hush hush . She could land any other hot guy she wanted to anytime