If somehow by any chance you we're looking for a sign, this is it.
Because no matter where you are or what you're up to, someday in the future when you look back on this day, you will keep on wondering what would've happened if you took that chance. RISK IT. It's better to know what it was going to end up to rather than leaving it hanging on the air.
If you break up, shout at him. Tell him off like the little scoundrel that he is! Or she, in whatever gender you are referring to. If you want to have a second chance, grab your phone and call. Even though you probably deleted his, or by any chance her, number on your phone, I'm pretty sure the number's on your mind. Tell him/her before it's too late. Fall in love. Get drunk. Be married. Have kids. Learn how to do make up. Admit you're gay. Wear baggy sweatpants to work. Finish your paper works. Go to the beach. Order pizza. Live your dream.
And instead of looking for signs, Get up and take the leap.