Welcome back to Farewell to Shadowhunters, TV Guide's celebration of the final run of Freeform's supernaturally addictive fantasy series!

While Clary (Katherine McNamara) and Jace (Dominic Sherwood) were dealing with the trials and tribulations that come with chaining up her demonic brother, Jonathan (Luke Baines), in the Institute, an entirely different, more romantic conundrum was plaguing Alec (Matthew Daddario). How do you propose to the love of your life while he's still recovering from a major illness and the crushing reality of his new human existence? Poor Alec had the perfect night set up to get down on one knee, but his plans were derailed when Magnus (Harry Shum Jr.) showed up mid-breakdown, forcing Alec to realize that marriage might not be on the Malec agenda for a while.

Shadowhunters' Matthew Daddario Says Malec Is Heading for Rough Waters

Matthew Daddario told TV Guide all about Alec's botched proposal and why it may have been a good thing that he didn't end up going through with it since this bump in the road might be a game-changer for Malec. He also described the "party atmosphere" of the last scene he filmed for the series finale that he thinks fans will love.

Catch new episodes of Farewell to Shadowhunters Tuesdays at 1:00 p.m. PT!

Shadowhunters airs Mondays at 8/7c on Freeform.

PHOTOS: The 100 Best Shows on TV Right Now: How Many Have You Seen?

Katherine McNamara and Dominic Sherwood, <em>Shadowhunters</em>Katherine McNamara and Dominic Sherwood, Shadowhunters