Well, I immedietely go into 'tough girl' mode. I do NOT want to let myself slip into the vortex of depression. I make extra efforts to smile, be confident, and reach out to others. Oddly enough, I'm typically strongest in myself right after a rejection.
How I vent it is:
-Music really helps, both singing and listening. Especially when the lyrics match my emotions.
-Complaining to friends. I overdid this after my first breakup, so I've cut it down quite a bit.
-Giving other people the love I wish I had, because they could be just as lonely as I am.
-Finding something else to be passionate about.
Overall, I just attempt to focus on more positive things in my life. I used to overthink it (to 'sort out my brain' and not let anything be bottled up), but I've lately discovered that it makes me feel WORSE. So, now I just redirect things to something better.
In spite of all of this, it takes me a reaaally long time to get over a loss, depending on the duration of the relationship. I can think and do all the right things, but I can't help how I feel.