Is he not over his ex?

I am seeing a guy that just been out of a long term relationship of 4 years And from what I know he initiated the breakup. We’ve been seeing each other for 3 months. Later I found his youtube playlist which he added some songs about missing his ex and wishing he could turn back time to fix things. The playlist seem to be updated regularly even a day before going on a valentine date with me giving me roses etc.. he was adding a song with lyrics about missing his ex. And a few days after our date he was adding sad depressing songs about life and past relationship.
Is this a red flag , Is he not over his ex?

Is he not over his ex?
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