Trust

Why is it so hard to trust the person I love more then anything with my heart. I mean this guy as always been up front and open with me and tells me everything but I'm still scared to trust him 100% with my heart and I'm scared its gonna push him away. He tells me he loves me more then life itself and i believe him but he use to be a real player before we got together and I'm scared he'll go back to his old ways. I just wish I could quit worrying about losing him and focus more on keeping him. I hate getting like this and pushing away everything that means the most to me :(