How do I fix it?

I've been hurt by a lot of people I love and so expect my boyfriend to do the same so I find it hard to trust him. I never believe him when he says nice, I read into it and feel like he's being fake. We've been together for 3 years and he says he's tired of explaining himself and tired of trying. He feels he has nothing to look forward too with me becaus he knows I'm just going to moan at him. He says guys don't forgive easily. I'm so scared I've ruined it. I love him so much and I feel so bad that I've doubted him. He says I won't change and he wants space but I'm desperate to trust him and show him I love him. I desperate for him to feel love for me again. How can I fix it? I want to give him space but how do I make it right again so he trusts me and loves me again?

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