Why did he call me on Valentine’s Day , he said it was an accident but he has a girlfriend?

So we matched on a bumble last year summer time things did not work out and there has been no contact for months. I had deleted his number and the text thread on what’s app months ago last year. I woke up on Valentine’s Day to a missed call from him when I messaged him he said he didn’t mean to. I have now found out he was on holiday with his new girlfriend when he called

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Should I tell his girlfriend
Why did he call me on Valentine’s Day , he said it was an accident but he has a girlfriend?
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