One of my good friends was dating a guy for like...4/5 years. I wasn't close to him, but I met him a few times and I thought they would get married too...then they broke up...it came as a pretty big shock. I was so thrown off by it. My thought went to "if they can't make it work, no one can". They did however get back together! So that kind of made up for it.
Sorry about your friends break up...hopefully it'll end up being a happy ending! If they don't get back together, it'll probably be for the best. Just be there to support them right now.
A piece of my heart lies with my Golden, now and forever. RIP Teddy. I love you.