Anyone SO freak out with BFP?

Kate • TTC baby #2

My boyfriend, who was happy ttc with me 2 weeks ago, is now MIA and has told me he can't do this. He is my best friend. Been together 8 years. He put a down payment on an engagement ring 3 weeks ago. I'm so lost. Has this happened to anyone and has your guy come back around? My heart is broken.