Lilly Kane
"I loved Lilly. And Lilly loved guys." This perfectly describes the relationship Logan had with Lilly. He loved her with his entire being. And while I believe she loved him, it wasn't in the same way that he loved her, as evident of her relationship with Weevil and her affair with Aaron. Their relationship met its demise when Lilly was murdered.Caitlin Ford
Logan's short-lived 09er girlfriend, portrayed by Paris Hilton. In the end, Caitlin was cheating on Logan with Weevil's cousin, Chardo. This relationship lasted only one episode.Hannah Griffith
Logan met Hannah at a school carnival. She's not quite sure why a bad-boy type such as Logan would be interested in someone like her, but his charm quickly gets the best of her. It's revealed that Logan is actually only dating Hannah because her father (who is a cocaine addict) is being asked by the Fitzpatrick's (his dealers) to falsely testify against Logan in a murder trial. Logan threatens Hannah's father with the possibility that he would seduce Hannah unless he racanted his testimony. Hannah realizes that she can't trust Logan, as he was only using her to get to her father. Logan then develops real feelings for her, and she quickly forgives him and the two start a genuine relationship. That is, until her father walks in on the two of them undressing. Hannah is sent to a boarding school in Vermont, thus ending things between her and Logan for good.Parker Lee
Parker and Logan got close after he was roped into being a participant in a Valentine's Day scavenger hunt with her, Mac and Mac's boyfriend. Surprisingly for him, he had a good time and enjoyed Parker's company. Later, both Parker and Logan - at seperate times - ask Veronica for her permission to date each other. Things are a bit rocky for awhile, as Parker cannot understand Logan's reasons for doing things as he does. She asks Veronica for advice, and Veronica does her best to help her. Parker ultimately ends things when she realizes that Logan still has feelings for Veronica.Kendall Casablancas
Well, okay. Kendall was never Logan's girlfriend. And actually, their "relationship" was more like an affair. And even that is too formal of a word. Logan was simply in this to get laid. As was Kendall. When Kendall decided she could use Logan to get what she wanted in other ways, Logan oh-so-eloquently delivered the line: "Bessie, when the milk stops being free, I stop drinking it." And that was that.Veronica Mars
Logan and Veronica shared their first kiss after he saved her from who they both thought was a kidnapper. He initially pulled away, leaving her to think it was one-sided, but he then pulled her into a passionate embrace. Later, he confesses to Veronica that he no longer has to feel guilty about moving on (from Lily) and the two officially start dating. At first, they keep their relationship a secret, as Logan's 09er friends still hate her, and Veronica is worried about how Duncan would react. Their secret doesn't last long, however, as they walk into Logan's house, kissing, at the same time his father decides to throw him a surprise "birthday" party. At that point, Logan tells the 09ers that if they have a problem with Veronica, they are "pretty much dead" to him. From here, they break up and get back together several times.Veronica: "So what are you like now?"
Logan: "You know, tortured... ever since I got my heart broken."
Veronica: "Hannah really did a number on you, huh?"
Logan: "Come on, you know I'm not talking about Hannah. I thought our story was epic, you know, you and me."
Veronica: "Epic how?"
Logan: "Spanning years and continents. Lives ruined, bloodshed. EPIC. But summer's almost here, and we won't see each other at all. And then you leave town... and then it's over."
Veronica: "Logan..."
Logan: "I'm sorry about last summer. You know, if I could do it over..."
Veronica: "Come on. Ruined lives? Bloodshed? You really think a relationship should be that hard?"
Logan: "No one writes songs about the ones that come easy."
Partial info taken from here.