Oh Brady, so sorry to hear this.
It's one thing to experience the heartache of love for the very first time, but to go through what you've just learned is flat out criminal.
As much as you love her and thought she was your soulmate (in my opinion) you'd be better off in the long run kicking this girl to the curb.
It would have been one thing if she had messed around one time at a party while at college, but to be doing this for FOUR yrs and with TWELVE different people? Then to cop an attitude after being caught that doing this isn't a big deal???
Brady, we all come to points in our life that the choices we make will put us on a good path or a path from hell (and these bad choices can haunt us for yrs and take us yrs to recover and in some cases we never recover). We'd love to turn back the clock and redo some of these bad choices that wrecked our lives.
You're at one if these crossroads RIGHT NOW my friend.
You need to really think this through, because there is a great deal at stake.
You haven't spent one day with this girl as your spouse.
She's been a girlfriend.
This is a time when you test each other out to see if the two of you click together, have the same morals, want the same things out of life, can you count on each other in bad times, and most importantly can you TRUST each other and have each others back NO MATTER WHAT!!!
Well Brady, based upon what you've shared with us, it's VERY apparent that this girl has flunked the test of being your girlfriend so there's no reason to believe that she would make a loving and TRUSTING wife.
This girl has shown you TIME AND TIME AGAIN who and what she is. She knows herself better than anyone and she flat out told you who and what she is. Brady as painful as all of this is I implore you to BELIEVE HER!!!
What most older people don't tell to young adults like yourself is being married takes a lot of work and it can be extremely difficult at times and in order to make it work you need not one but BOTH partners all in.
It's like when you go on a job interview and you spend a bit of time on the phone interviewing and than you go to the next stage and go in for a face to face interview. At the end of the day all the employer sees is the tip of the iceberg and they try to make a guess on the future by the little they've seen ( and the candidate is doing the exact same thing).
You've seen the tip of the iceberg with this girl, and based upon what you've learned about her (and what she's been doing the past four yrs) it's very apparent she's not worth investing in or committing to as it will only come back to bite you in the ass!!!
I feel for you as you're trying to deal with this and trying to finish up school. Take care of yourself Brady.
As horrible as this is Brady please believe me you WILL GET THROUGH THIS!!!
You have to keep the faith.
As others have pointed out better to find this out now than down the line when there could be yrs invested in the relationship and maybe even children.
Will be praying for you Brady.