When you break your virginity, the hymen breaks. It's a thin or thick wall that protects the vagina, and most times it bleeds when a woman has sex for the first time. Try urninating before sex to see if that helps. If not, it could be anything from a UTI (urinary tract infection) to an STD. You should see your doctor to make sure that it's nothing serious.
Get it checked. If it's testicular tortion he could lose a testicle.
You need to get him to see a doctor ASAP.
Give each other some space. After two people break up, they do one of two things:
1) They idolize everything about the other person and want them back so bad.
2) They find the other person incredibly annoying.
Either way, you need to give each other some space.
It was probably a pimple. I wouldn't worry about it too much. If it spreads or swells up, you should see your doctor.