Ok here's my input.
You love her, right? I mean, you fell in love with HER not her sexual history. Love isn't so easy to find. Let's say she told you about this 14 years ago (after you had already fallen in love with her) You would have walked away, correct? But why? Because of sexual experiences she's had? That doesn't sound very fair to me. A person's being is a lot more than their sexual orientation, or activity. If you loved her before you found out about this, you should love her now. So she experimented before she knew you, so what? You say that it makes you feel sick that she did that "with and for" another man...but why? At that point, you weren't even on her radar, neither of you knew the other existed, so she didn't wrong you.
I'm sorry that you're hurt that she didn't tell you, but as another poster said... "she wouldn't have had a snowballs chance in hell" with you if she had come clean about that...and if it's "true love" she did you a favor...just think of all you would have missed out on! (14 plus years of marriage)