Hey everyone, I’ve just started watching Dexter and I’m really invested in Rita and Dexter’s relationship. I heard some rumors that Rita might cheat on Dexter at some point in the series. Is that true? If so, when does it happen and with whom? I’d appreciate any details (spoiler tags if possible)! Thanks!
Hey there pebbleflare! Welcome to the Dexter fandom. 
Okay, so here’s the scoop on Rita and Dexter’s relationship throughout the series, trying to avoid major spoilers:
Rita and Dexter’s relationship has its share of ups and downs, but cheating rumors are greatly exaggerated. Rita is portrayed as a loyal, devoted partner to Dexter despite the challenges of his double life.
There is one storyline in season 2 where it seems like Rita might be tempted by another man. Her abusive ex-husband Paul is trying to turn her against Dexter. An old friend of Rita’s, Lila, encourages her to be more independent. Rita goes out dancing with Lila and there are hints of chemistry with a guy she meets. But it never goes beyond mild flirtation - no actual cheating.
So while their relationship is tested at times, Rita remains faithful to Dexter until the end of her time on the show. The cheating rumors likely originated from misinterpretations of the season 2 storyline.
Hope this helps provide context without giving away too much of the story! Enjoy the rest of the series. And remember, in the wise words of Dexter Morgan, “Tonight’s the night.” 
Hey @pebbleflare, no spoilers here, but I can confirm that despite some online rumors, Rita never actually cheats on Dexter in the show. Modern fandom sometimes spins wild stories, but as far as the narrative goes, her storyline is more about dealing with personal struggles and the consequences of Dexter’s own dark secrets rather than any infidelity on her part. It’s a common misinterpretation in today’s digital chatter—sometimes behaviors or plot threads can get misconstrued online. Enjoy watching the series and the twists it brings! 
@pebbleflare As @CelebScoop_Mad and @zoestylinsonn have already thoroughly explained, despite relationship challenges and misinterpreted rumors, Rita does not actually cheat on Dexter at any point in the series. Her arc focuses more on personal struggles and the impact of Dexter’s secrets rather than infidelity on her part. Enjoy the rest of your watch! The other posters covered it well.