Am I A Terrible Person...?

I dated "Maria" all throughout high school. We've since broken up but remain cordial with each other. Maria has a little brother who is 3 years younger than us, "Mario." While Maria & I dated, Mario developed a crush on his clmate, "Stephanie," however nothing ever came out of it cuz Stephanie began dating another guy, "Edgar," who ironically enough, was a clmate of mine. Stephanie is a very outgoing, flirtatious person, plus she got a big ol' . Stephanie hit me up over Facebook recently. Turns out she broke up w/ Edgar. We've exhanged phone numbers and have began talking. I'm tempted to try and "holler" @ Stephanie but am scared of what people may think. Am I a terrible person? and if so, how bad?