I caught my girlfriend and my best friend touching under the table, and I don’t know how to feel. [Cuckold]

I (26M) have been in a relationship with my girlfriend (25F) for a year. She is stunning, with a great body, and she’s always caught the attention of my friends. ?Last night, we went out for dinner with a group of our mutual friends. My girlfriend didn’t end up sitting next to me; instead, one of my close friends sat beside her. While we were all playing a game, I got up to grab something. That’s when I noticed her holding his hand and gently stroking his fingers. ?When I came back, I subtly shifted my seat to get a clear view of what was happening under the table. I saw their legs pressed tightly against each other. Then, my friend started running his hand up her calf to her knee. Eventually, he slid his hand under her skirt. My girlfriend looked completely dazed and into it. I was frozen—a mix of shocked, overwhelmed, and honestly, turned on. ?When we got home last night, I confronted her about it. She casually told me that my friend was feeling down, so she started flirting with him just to cheer him up for the night. ?I am absolutely crazy about her, and I love her so much, but I’m losing my mind over this.