anxiety with trust

Recently, my man has really ruined our relationship in a sense that the trust i had built for 3 years came crumbling down because he took a small situation (that could have been prevented with communication) and turned it into the worse, most fucked up situation ever (for our relationship at least). It hurts me... ALOT. I cannot stop thinking about his actions. He claims he's sorry and wants to make it up, but i am actually SCARED to trust him again. Forgiving him will be a process, but trusting him again? i don't know. any advice?