Help me I’m lost and stressed?

I’m confused, me and my now fiancé been together for almost a year next month, now he saying to me hurtful things, he says to make we should take some time off. Yesterday he wanted to break up for because he can’t handle the fact that I have a past, I just don’t get it things will be great then bam 💥 this happens I’m hurt and confused I don’t know what to do. In my opinion you don’t propose to someone and then tell them their a horrible person I’m lost
Help me I’m lost and stressed?
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