WIBTA if I confront my ex?

I posted this on another AITA subreddit, thought I’d post here too.

So, I’m at a huge stump here. I broke up with my ex (both of us are 19f lesbians) about a month ago now for mental health reasons, nothing more or less. We’re still best friends and I feel myself actually falling in love with her rather than being blinded by insecurities and fear of not reaching expectations. She’s a wonderful girl who has never hurt me, or made me doubt myself. There’s just one problem.

From the start, she’s told me that she’s never touched or even kissed anyone else before, and I believed her wholeheartedly because she’s someone I trust completely. However, I found that to be false today. Today, she told me that she’s kissed multiple men before, one of which touched her inappropriately. I feel super betrayed that she never told me about this, mostly because I trust her so much.

Here’s where I feel like I’d be an asshole if I confronted her about it; she said she never wanted to and only did it because her friend made her do it, but I feel like this is something she should’ve told me regardless of whether she wanted to or not. I feel selfish for feeling this way because I know she’s a lesbian and not attracted to guys in the slightest, but I feel like it’s weird to just not bring up the fact that you did things with them because you’re not. I feel like I’m spewing nonsense, but I just don’t know how else to put this and my family doesn’t know about her. Please just tell me what to do.