PLEASE HELP: Is my boyfriend cheating or am I too paranoid?

Anonymous
I'm a BLONDE. Yesterday, I found a piece of long, BRUNETTE hair on my boyfriend's bed. It's definitely a girl's hair since it's very long and none of his male friends have long hair. I looked at it very closely, it's still brunette (brown + a hint of red to be exact), and none of my hair is that color. I bring it near the window where there's sunlight, it's still brunette! It's definitely not my hair! I confronted my boyfriend about it. He said "Stop it. It's definitely your hair. You're too paranoid" then he threw that hair away. Is my boyfriend cheating or am I too paranoid? It's definitely not my hair! What do I do now?
PLEASE HELP: Is my boyfriend cheating or am I too paranoid?
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