>>but we told them we don't think we want to, we just don't think we could do it. <<
We, we, we, we.
A pregnancy should be discussed between a girl and her partner. Not decided in cahoots with her best friend.
From the point of view of the boys: Two best friends get pregnant at the same time. Can't possibly be coincidence. They are looking at the issue in terms of what they will do together instead of each individual couple sorting it out between them. Obviously the girls planned this together and tricked us.
Heck, if one of you was my daughter, and I was listening to your joint timing and joint attitudes, I'd think that you planned this with your best friend and I'd be furious with you.
Sorry hon, but this is how it looks from the outside. I'm not surprised that they've walked away from you.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.