Loss of trust

My last ex bf and I had slept together within the same week that I had met my now most recent ex bf. Although we were long distance, I fell very quickly for him and we told each other we loved each other after a week. I recently told him about my ex and he believes that it was never really love to begin with. I know that my feelings have always been true towards him but because I kept the fact that I slept with with my ex the same week we met a secret and lied to him about it, he doesn’t believe anything I say. I realized I was wrong and I never wanted to hurt him..I sincerely apologized and have been trying to prove to both him and myself through my actions that I am not this monster that I had showed him. I really do love him and he doesn’t believe it one bit. I have tried to talk to my family and friends but nobody really listens when I speak..any feedback would be greatly appreciated. Thank you!