She said another guy is really hot

Went on a long first date with a girl, dinner, walking around for hours at a park, kissing ended with sex. She claims shes looking for a relationship and never had sex on the first date. Felt like there was a deeper connection

Anyways. Two days later she sends a random text that a really hot guy was at the gym. When we meet i asked her calmly ( telling her i wasn’t upset just wanted to see how she thinks)if shes trying to get me jealous because i dont like games.

She gets defensive and says im taking it too seriously and it was just a random though because she was bored workingout. She then says she made it up and there wasnt a hot guy she just wanted to see my reaction. Then she kept asming to change the subject.

Was i insecure? What was her goal here? Is her reaction strange? Just looking for inputs