there's a marriage at the end of this wedding

I feel that Aaron and I have what it takes to make it.  I feel that in my bones that's how much I believe it.

We are total goofballs and we will do practically anything to make each other laugh.  That is my favorite parts about us. 

Well lets just assume that Aaron and I live to be 90.  *Fingers crossed*

What happens if and when that laughter stops at some point within the next 63 years?   I guess I just have no idea and no example in my life of how that works.  At least Aaron's parents are still together but I've been living with a single mom since I was about 5.

How long does it really take for people to throw in the towel?  When do people let go of the "till death do us part"?