Ex flipped me off in passing. Is she bitter cause she left me or what?

So to make it short. My ex left me after we had a little out of town trip July 2022. We had slight communication in August and she even planned to come see me once which day of she started a argument and never happened. Fast forward to today March 2023. I'm over all of it. I'm waiting to turn off a road onto a main street when her new guys truck pass by and a middle finger from the passenger seat obviously hers no doubt is seen clearly from the window. I laughed and thought if texting her asking her why but decided not to because I don't care that much. Despite asking you guys she is easily angered but to still be like that after 7 months it's kinda pathetic

Ex flipped me off in passing. Is she bitter cause she left me or what?
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