Guy's Behavior

Should I let this go/am I overthinking this situation?

One of my best guy friends and I (F) were at a 7 eleven waiting in line at the cashier. He really likes me and I like him a little to but we agreed to be just friends for now. I tend to overthink a lot and he was walking behind me as he waited for me to pay some stuff and I felt a very slight bump (not really a bump, but like a brush) against my bum. It was almost non existent. Was not a grab nor a stroke, so I’m assuming it was an accident as he was walking behind me with his arms side by side behind me and was always looking forward as if he was just wandering. My mind won’t stop telling me it was an intentional brush or a perv move when it was probably just an accident. All my irl friends say it was probably an accident because wtf would he gain from brushing the side of his arm slightly against my butt. That it was an accidental bump/brush. Anyways, he’s the sweetest guy and never has disrespected me so I also think I’m overthinking. Opinions.
Should I let this go/am I overthinking this situation?
Post Opinion