Am I fooling myself?

After being seperated for a year (I was the one who left) my husband and I have reconciled. During our year of seperation, my past infidelity came to light. My husband and I have talked about it and he says he is willing to leave the past in the past and move forward. He asked me to get tested for STD's and and I did. (all is fine). We have been back together for almost three months now and things are going okay. I know everyone says that once a cheater, always a cheater, but I don't think that's true. He and I both learned a lot during our year of seperation and I have no intention of ever cheating again. I realized that my husband and children (my family) come first and that I was a huge fool to risk all of it. Both of us learned just how much we do love each other and don't want to be apart. I guess my question is this....will this really work out, or am I just being a fool?