You know, the guy I dated for a couple years in college cheated on me. When I found out, I left him. On my 22nd birthday 6-7 weeks later, he let me know that he had bought my engagement ring several months before and was planning to propose that night. Asked me if I wanted to at least see it, etc.
That night, I gave myself ten seconds to cry over it. Then I promptly pulled myself together and went out to dinner with my roommates and then out on the town (without the girls, who went to bed) to dance the night away.