@HML,
Wow, just read all this and my first thought is, what a bunch of juveniles. It all sounds very immature. A lot of anger, a lot of acting out on passions without thought of consequences. You both need to learn how to communicate without punching walls. Your dad is mad? How did he get involved. You sound like a bunch of children that got married way too soon. You are acting like my 2 and 4 year old grandchildren. Very selfish.
No, you can't trust yourself alone with #3. So why even entertain that thought. Even if your marriage goes bad, stay away from that guy until maybe 2 years after the divorce.
You and your spouse are both being very self centered and selfish. If you want to save the marriage, get some counseling and pay attention. Learn how to understand the other person's point of view and how you make them feel.
Don't let this be the first in a string of bad relationships. Learn from it and try to see what is really causing your feelings and what you can do with your own behavior to improve things.
Either way, get some help. From a counselor or clergy if you go that way.
You are kid and it's time to grow up.