My dating app match turned out to be my cousin’s ex

This is awkward as fuck. I matched with this girl on a dating app and we’d been talking for like 2 weeks. She seemed really cool and we had a lot in common. We finally decided to meet up for coffee yesterday and the conversation was going great until she mentions my cousin’s name. Turns out they dated for like 6 months last year and it ended pretty badly. She had no idea we were related until I mentioned my cousin (we were talking about relatives) and then we both just sat there in silence for like 5 seconds. The whole thing was so uncomfortable. She’s actually really nice and we both really like each other and under different circumstances I think we could have hit it off but this just feels too weird. I don’t even know if I should tell my cousin about this or just let it go because I really like her, but knowing the fact that she dated my cousin is something that will always be brought up during conversations in case I actually decide to date her.