He told himself that it was pointless. That his painfully unrequited crush would always stay like that– unrequited. That no matter how much his heart ached for Sirius, he couldn't act on his feelings, because there was no way Sirius would ever return them.
But he couldn't help but feel a little lighter when Sirius strode right past a swooning girl, or completely neglected to notice that a girl was flirting with him. He held tightly onto the fact that Sirius had never had a girlfriend, even as he told himself that Sirius was straight.
Everyone needs a little hope.