There’s a lot more wrong with this situation than what you two are characterizing as “lies.” First, there is a difference between lying and maintaining some privacy. There is no rule that a person has to share every detail of one’s life in order to be trustworthy. It’s not new information to your boyfriend that you were intimate with others before him. The number isn’t the issue.
Secondly, he has a strange double standard. It’s okay for him to have had sex with 50+ women but he thinks a woman who has had a number of relationships is gross? What century is he living in? Does he think he’s gross? Or only experienced? Why does he judge you differently than he judges himself?
Third, you kept some things private because you were afraid of judgment. You didn’t believe he could offer you comfort and compassion for some mistakes you made. My guess is that all of his 50+ relationships weren’t stellar either. Please ask yourself why you want to be with someone who you don’t think will be supportive and helpful.
Finally, your boyfriend is now using this new piece of information as justification for not trusting you and for making you walk on eggshells. Instead of looking at what a loving and faithful person you’ve been, he is focusing on this one issue (an issue that I feel should be a non-issue).
You can’t change this situation. He has to change his attitude towards women and his issues about the fact that women can be just as sexual as men. I don’t know why you love this guy. I don’t think he’s worth your time or your love. Please think hard about whether you want to live the rest of your life always “on trial.”
I wish you well.