Should I date a best friends Ex?

Me an my friend are not as close anymore. We are friends but don’t see eachother a lot or speak a lot. She dated this guy about 6 years ago when we were younger. They never got to the relationship stage but were exclusive for some time and she really loved him. I am now starting to notice him abut because he now watches my stories whenever I post my face or a selfie. I never watch any of his because I didn’t want to seem interested or make it look like I wanted him all those years ago and I still don’t watch his stories now. I have seen him recently at an event. There were a lot of people so we were not in close proximity to eachother. I did meet his sister about 6 years ago and we have brief conversation as he was seeing my friend then. However, I looked across the room and his sister’s husband was staring me down and then so was she. It wasn’t in like a bad way but I think more curious but I just thought it was strange because I have never met her husband and I don’t really know what reason they would have to keep looking at me. My friend’s ex was also there but he was minding his business. What does this mean? Is there any potential there?
Should I date a best friends Ex?
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