What would you do?

I have been in a relationship for 7 years. I have a 3 year old daughter. From the start my partner told me he was a virgin yesterday he tells me he's slept with 21 women before we got together. We got together when I was 15 he was 16. I feel like I've been cheated on and I want to end the relationship. Am I being over sensitive
What would you do?
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