He didn't actually love them both, he knew that deep inside.
He probably was IN LOVE with Lauren B. (Or production made it seem that way) but felt things for JoJo too.
I love the bachelor and Ben so I know this stuff.
He felt stronger for Lauren, so he picked her.
It doesn't discredit his feelings for JoJo. She didn't do anything wrong, it's just what he felt for Lauren made it stronger.