Best friend and Boyfriend

Last night at a hangout, my best friend was off with my boyfriend most of the night talking about her relationship issues. They got close on a trip we went on and I was fine with it, it made me happy to see them get along. But this morning, my boyfriend told me that she followed him to his car when he was alone after she’d had a couple drinks and said “I feel so bad for you because your girlfriend is so hard on you.” Me and him have discussed this before and both feel we treat each other well. I’ve just had an off feeling about this all day, what are y’all’s thoughts on what she said? (She met him through me)