Smart girl fth.... so glad you did the math and thought down the road. So glad he's giving you a better offer than the other option. Take it!!
Oh yes, this is a slap in the face alright! I've been through it, I know! I understand the curiosity of checking face book out. I did that, and never saw anything of those two together, but got reports from my girls all the time. Just because they were disgusted by what they saw. And I saw them together for the first time 4 years post BD almost two weeks ago. It still felt odd, but I had 4 years to get used to it.
My advice is.... you need to let these emotions wash over you! They're going to come in waves, and by the end of this you will be an excellent surfer! All you can do is ride the wave, and ALLOW yourself to feel what you feel. Don't tell yourself it's bad or you're wrong for the feelings you're experiencing. You and everyone else here has experienced betrayal on many different levels. It's ok to be bitter! Heck I've been bitter for a while now!
As time goes on, life and God has a way of evening things out. Things will not always be rosey with those two, I can guarantee it. It's just a matter of time before infatuation and real life settles in with those two. Trust me. The consequences of their actions will surface. I guess what's so hard about it is that it's not on our time line, but God's.
