I think the answer would vary depending on the people. For me, I crave solitude and one of the reasons my first marriage failed was that he was too clingy and dependent. He couldn't take initiative to do anything without being reminded. If I wanted to do something on my own, he insisted on tagging along or would call me and ask stupid questions while I was gone. "How do I heat this up?" "When should I put the baby to bed?" all stuff he could figure out, but wouldn't. It drove me crazy and then eventually drove me away.
My current hubby and I have a nice balance. We are best friends, but we give each other space to be who we are personally also. We are both introverts, have the same core values and most importantly we communicate. If I feel off, rather than get bent out of shape, he'll ask me "Is something bothering you? You want me to take the boys out for a bit?"... SO sweet. He knows how I am, doesn't try to smother me, distract me, or "fix it" - just trusts me to handle whatever is bugging me and come to him when I'm ready.
I recognize his moods too - and I know when he's down and I'll do things that are nice, like distance myself awhile and go fix his favorite dinner. - he loves that so we stay really connected because we truly listen and understand the needs of each other - not fixate on our own needs/wants.
"Winning back" someone depends on the person. If they need more attention - pay attention to them. Sign up for a class together or do something new and interesting (and slightly risky) to respark that tension and passion. If your partner is introverted - give them some space and trust that the space doesn't mean they don't love you, but just need some down time.