Is it wrong that i still like her?

So, theres this girl i really like. We used to have our moments and she "wanted to be something more than friend" with me in her words, until she met one of my friends and started dating him. Were still friends and we still talk, and i still really like her (which sucks because i keep thinking about her 24/7). My conscience keeps telling me that i have no business liking her because shes already in a relationship and stuff like that, so is it wrong that i still like her?