If a 42 year old man has been with a new girlfriend for 2 years why is he still looking at his exes social media?

He jumped into the new relationship only a few weeks after his ex ended it with him, although they remained on amicable terms. If he’s happy in a new 2 year relationship and his new partner is pregnant, why would he still watch his exes social media posts and visit her profile to watch videos etc?

If a 42 year old man has been with a new girlfriend for 2 years why is he still looking at his exes social media?
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