I think that he did it for Bowser Jr. so he can grow up with a mom, too.
Not sure on that one though, the truth to why Bowser kidnaps Princess Peach is a bit controversial and obscured... :/
Not exactly...
She still fears and rejects Bowser no matter how hard he tries to get her on a date with him because she wants Mario instead (unless if Bowser forces Peach to be Bowser's bride via threatening her (which is rare, but has happened before)).
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