Does my bf have too many ual partners?

I just recently learned my boyfriend of 2 years was completely promiscuous in college! In 1 year he slept with 12 people. By the age of 20 he slept with 18. That's where I came in and I suppose stopped the trend. My question is, I asked for the information and he told me the truth. How do I get over feeling so angry about this? Feel free to e-mail me... I am so open to have discussions about this subject.