>What makes it even worse is she told me that they hooked up after a week or so of texting, and it took maybe a month and a few dates before me and her ever slept together

Is it a competition though?

Are you disappointed because it took you longer to sleep with her than someone else? Maybe she regrets her action and wanted to take things slow so she doesn't get burnt again.

Look man. This is a you problem and nothing more.

There will always be someone before you and someone after you. If you allow those thoughts to poison you and jeopardize relationships, you will never be able to maintain a healthy one. You will always be the downfall.

I never understood this notion of needing to know your partners past. I am 30 years old, and in all of the relationships I've had, we never discussed sexual history. Its better not to know.

So, if its not this relationship, for the next one, leave that conversation off the table.

You need to focus on the present and why she is with you and not other people. If you're in her life, there is a valuable reason for it.