"Independent and don't need anyone to take care of me" sometimes translates into "I don't trust that anyone will love me enough to provide the same level of care and support that I give to a partner so I will pretend that I don't need it"
Don't dismiss you're sister's opinion of your spouse. She may be seeing things you don't. My family didn't say anything but they didn't exactly fall in love with my ex when we were dating; I should have paid more attention to that.
And while the BEST part of the DB process is self examination and change.....were you REALLY unsupportive of him, or just tired of not getting your needs met and carrying the weight in this relationship?