How long should it take me to get over this?

My boyfriend of three months (I know that's not a long time, but he was my first boyfriend) broke up with me for his exgirlfriend from high school (we are freshman in college). I also realized after the breakup that he was contacting her the entire time we were dating. I'm eighteen, and up until now I have avoided dating and everything (not form lack of offers, just because, I don't know, I never like anyone enough to date XD ). What is a reasonable amount of time to get over this, because he is my first heartbreak, plus I have the added sting of being kind of cheated on/used as a rebound and left for someone else? :(
How long should it take me to get over this?
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