Banging my head against the wall.....

it's 4 weeks before my daughter's wedding. She's 18, he's 20. They have our one grandchild Rian, 16 months. Now, they've decided to start arguing and he's moving out of the apartment they just rented. They got a car together, furniture, all on credit of course. I am so frustrated that they cannot see how things are going to fall apart BADLY. I keep telling myself that it's their lives, they have to make their own mistakes just like everyone else so maybe it will work out in the end. In the meantime, I worry....and worry. Just venting. There's just some things that a seam ripper and re-stitching can't fix and it bugs me!