"i-.. don't blame yourself. It's on me." Robin says with a heavy sigh after finally confessing his longing love for you since you joined.

He and starfire were still a thing they've been together since- who knows how long now. He felt out of love already for Star before you joined the teen titans.

He feels guilty, yes. He's gonna break Starfire's heart? He can't. But he loves you. Despite his confession he needs advice and comfort.