What can he mean by stuck in reverse?

Sometimes my husband listens to moody songs. I get that. He shared videos on Instagram. He listens to radiohead and coldplay a lot. But now a days his captions are a bit sad. His insta bio says "stuck in reverse" from the coldplay song. He shared the lyrics of daydream by radiohead. I know I'm worrying too much. But I can't shake the feeling he might be sad that his first love got divorced from her abusive husband a week after we got married. And yeah I stalked her, she also shares similar nature videos and same lyrics. Both their profiles are private and they don't contact each other. Am I being anxious for no reason? They never dated but he was in love for a long time.

They're both good people. I love him. But am I worried out of the blue?

What can he mean by stuck in reverse?
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