Am I a slut?

So my ex boyfriend and I broke up 2 weeks ago - we broke up because I left him for being abusive, lying and cheating. Last night I got drunk with some friends and had a threesome and tonight I have a date with a guy I dated in high school. Does this make me a slut because I just got out of a relationship? Or does it not matter because I'm a single women? I almost feel guilty but I think it's just because I have been with another man in years.