Luke Ward

First Relationship

Started - Before Season 1 Episode 1: Pilot

Ended - Season 1 Episode 4: The Debut

Why: Luke got jealous of Ryan and Marissa hanging out together too much.

Second Relationship

Started - Season 1 Episode 6: The Girlfriend

Ended - Season 1 Episode 7: The Escape

Why: Marissa caught Luke cheating on her with one of her best friends in Tijuana.

Ryan Atwood

First relationship

Started - Season 1 Episode 9: The Heights

Ended - Season 1 Episode 17: The Rivals

Why: Ryan attempts to inform Marissa of Oliver's lies and his unhealthy obsession with her, though she refuses to believe him. After repeated attempts to get her to turn against Oliver, Marissa breaks things off with Ryan.

Second Relationship

Started - Season 1 Episode 24: The Proposal

Ended - Season 1 Episode 27: The Ties That Bind

Why: After discovering that Theresa is seemingly pregnant with his child, as the two had been in a relationship during Ryan and Marissa's break-up, Ryan decides to move back to Chino with Theresa despite his feelings for Marissa.

Third Relationship

Started - Season 2 Episode 20: The O.C. Confidential

Ended - Season 3 Episode 16: The Road Warrior

Why: With Johnny just dying and the new girl Sadie coming along it's made things complicated. Ryan starts to think that Marissa and him are not really working out so he calls her and she agrees with him.

DJ

First Relationship

Started - Before Season 2 Episode 1: The Distance

Ended - Season 2 Episode 2: The Way We Were

Why: DJ thought that Marissa and Ryan were dating

Started- Season 2 Episode 4: The New Era

Ended- Season 2 Episode 8: The Power of Love

Why: DJ realised Marissa was only dating him to get back at her mum

Alex Kelly

First Relationship

Started - Season 2 Episode 12: The Lonely Hearts Club

Ended - Season 2 Episode 16: The Blaze of Glory

Why: Alex realized Marissa still had feelings for Ryan and wasn't that into her like she was to her so Alex broke it off with her.

Kevin Volchok

First Relationship

Started - Season 3 Episode 18: The Undertow

Ended - Season 3 Episode 23: The Party Favor

Why: Marissa catches Kevin making out with another girl at prom she slaps him across the face!!!

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