I have to go on and if it means that I'll find a new relationship that will make me happy...great....
Only you can make yourself happy. Once you are, a great relationship is the icing on the cake.
Having said that - after 18 months, what's the harm in dating? I wouldn't advise dating anyone exclusively because girlfriend there are plenty of fish in the sea and dating is a great way to make new friends, enjoy activities, engage in the world - it doesn't mean you have to settle down with the first guy you click with!
have fun.
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Never make someone a priority, who makes you an option.