Jonah was Finn's first boyfriend, but what he didn't know was that Jonah has a problem with people. He's highly intelligent. But moves to a beat of his own drummer..so to speak.
He has Aspergers. And so thinks he's in a relationship when he really isn't. Perhaps a romantic a heart, but not a physical person when it comes to a relationship. Although, he did have an outburst of sorts when he found out Finn was with Doyle.
Now he's moved on, and considers Jules his new boyfriend. However, its a bit of a one sided relationship.