The couple met on the set of Pearl Harbour and made their first public appearance as a couple while at the Boston Red Socks opening World Series game in October 2004.
While they were filming on Daredevil, Garner was doing a stunt and got tangled in the wires that she was using to flip herself upside down. She nearly crashed into the wall that she was supposed to be flipping off. Affleck saw what was going to happen and grabbed her before she hit it. She said: 'It was like he was superman.' (IMDB)
The couple would have appeared in three films together, the aforementioned two and Elektra; however his scene was cut out at the last minute.
The couple apparently ignore anything that is written about them, given their popularity in the press, Garner said in 2009 "Ben taught me that you cannot read that stuff, that it's poison." (Wikipedia)
Affleck proposed to her on her 33rd birthday with a 4.5 carat diamond Ring by Harry Winston.
They married on 29th June 2005 in the Caribbean, while Garner was 4 months pregnant, in a private ceremony at the Parrot Cay resort on the Turks and Caicos Islands. Garner wore a Vera Wang Dress while Affleck was in Hugo Boss.
The whole thing was officiated by Garner's Alias co-star Victor Garber.
The couple now have three children together; Violet, Seraphine and Samuel.
The pair have homes in Los Angeles and Massachusetts and an apartment in New York. They also own an 83 acre Hampton Island near Savannah Georgia.
Garner was asked about the possibility of working with her husband again on set and said: I think he's brilliant at what he does, but why rock the boat? It works between us pretty well the way it is. I don't know if I want to go to work with him. I'd be like, "Okay already, you got the shot. Let's go home!" (IMDB)
Affleck and Garner announced they were divorcing on June 30, 2015.