Can someone explain this dynamic?

So I’m sure most of you have seen my posts about my ex girlfriend treated me. Well there’s this blonde I work with who honestly could be a model who is more attractive then my ex and seemingly treats me like a human being she’s married but the point of it is whereas I would have to struggle to get my then girlfriend to talk and where I felt it shouldn’t be that hard to just talk. This girl does it so effortlessly she will just start conversations with me and is seemingly interested in what I’m saying.