Losing friends after marriage.

This seems a little strange to me, but lately I've noticed most of my friends seem distant. One of them even took the time to call me weeks before my wedding to try and talk me out of it. Her reason' he could be like her ex'. Seems loving but he's not' she told me. She  spent hours on the phone telling me just how bad her relationship was. And that I should definitely reconsider getting married.