what is the answer effects on the body are become very aggressive, paranoia, hard to sleep, increases heart rate and breathing.

It could be Amphetamines, Ritalin, Alcohol, Parasomnias and/or Hypervigilance

Explanation:

Any of these have all of the following effects you listed. Most of those could result from drug abuse. However, few are just your body's way of telling you something is wrong.

answer:

forgive and forget

explanation:

let the things you had just sink in and build off of it and make a newer and better relationship like that one special person but dont do it the wrong way. just build lol. it's simple but hard. i promise it's worth it in the end