My girlfriend has a girlfriend, and I’m not sure how to feel about it. Any advice?

I've been dating my girlfriend for a few months, and we love each other. Early on, she told me she was bisexual, which didn’t change how I felt about her. However, about a month ago, she revealed her strong desire to explore being with a girl and wanted to experience it. Wanting her to find herself, I supported her decision.
After she started seeing this girl and becoming intimate with her, I began to feel insecure. She reassures me that her feelings for me haven’t changed, but I can’t shake the feeling that something’s off. It’s making me doubt the trust we built, even though she hasn’t given me a reason to distrust her before. I’m also starting to feel like I put more effort into our relationship than I’m getting back. She’s almost in a relationship with both of us now, and I don’t know how to handle these feelings.

My girlfriend has a girlfriend, and I’m not sure how to feel about it. Any advice?
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