It really happened!
Penny and Leonard are engaged and ... Raj and Emily had sex. Both were notable events for this group of friends and worthy of celebratory cheers and hugs on The Big Bang Theory Season 7 Episode 24.
Sheldon didn't handle the news well once he realized that Leonard wasn't going to continue to live with him. He doesn't handle change well unless it's of his own making. He was desperate to change fields of study, but the university refused because his job and funding were tied to his work on string theory