Nope. Keri Russell & her Husband/Co-lead on the show are undercover KGB spies in the U.S. and their marriage has always been a cover so they can blend in as just another white family in the Suburbs.
In the first episode with Derek Luke's character Gregory (episode 3), he constantly reminds them that their marriage is just a cover and what Derek & Keri had was real and tells her he is still in love with her. Keri's character seems to be in denial & doesn't want to hear it. Derek seems to of course have the Husband feeling some type of way & jealous especially after Derek & Keri separately tell the Husband their backstory together.
EDIT:
Here's a promo for that episode:
https://www.youtube.com/watch?v=d8A4n0L9mx0
[YOUTUBE]d8A4n0L9mx0[/YOUTUBE]