Yeah he did, and everyone on the show's busting his balls relentlessly, some with true anger since he ridiculed them for getting married. They're playing clips of him berating Scott DePace and stuff on the air (he's their TV producer) for getting married and some other clips...
Robin bet he'd get married though and she won... He went from never getting married to just getting engaged, to discussing it with her but "not seriously", and ultimately got sucked into it... Hey, who wouldn't marry her if there was the opportunity there?
Everything that's ever mentioned about her, not even on the Stern show but in general, says she's a good person inside too so it's tough to blame the guy.