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Jason Todd doesn't say "I love you" because he finds it hard to make these words leave his mouth. But that doesn't mean he is not showing it anyhow else.
Jason doesn't say that he loves Bruce, but he spends some extra time preparing rubber bullets when they are on the mission together, and tugs him away when they accidentally stumble across the dead family in the Alley of Crime.
Jason doesn't say that he loves Dick, but he knows when his brother is close to the meltdown, so he musters some courage to appear in his doorway, pretending that he needs some company, because Dick would never admit that he himself needs someone to have his back.
Jason doesn't say that he loves Tim, but knowing how overworked he can be, and how little he cares about his nutrition or the mess in the house, he sneaks out in his apartments to clean it up and prepare food in various lunch boxes, for the week.
Jason doesn't say that he loves Damian, but he drags him around the "unbecoming, childish and immature" places, because Damian is still a child, who needs to have fun, but he is too shy and too unexperienced to admit it.
Jason doesn't say that he loves his parents — all of them, Catherine, Sheila, Willis — but he makes sure to visit their graves and speak with all of them a little.
Jason doesn't say that he loves Gotham, but he makes sure to use money he has on anonymous donations here and there.
Jason doesn't say that he loves the Alley of Crime, but he does his best to protect it as the Red Hood and often volunteers to teach kids some basic educational stuff as Jason, earning being called "Big Brother" on the streets.
Jason doesn't say that he loves himself... Because, honestly, he doesn't.
But when a little ghost of second Robin sometimes visits him in his sleep, Jason teaches himself not to be mean and spends time with the boy, reassuring him that it was never his fault.
Jason Todd doesn't know how to say "I love you" to people, but when someone finally tells it to him, he breaks down crying.
He can't remember the last time someone said it to him.