He lied about the engagement ring, said it was 2 carat and that his mom set is aside specially for her future daughter-in-law, etc. etc. ...

Turns out that was all a lie. It is a 1.5 carat, and his mom bought it for herself.

LVM behavior? What do I do? Should I get married anyway? But it seems like too small an issue to complain or walk out? Help me, ladies.

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Edit: thanks ladies for the responses. Suppose he offers to buy a new ring, what should I do then? He claims he really believed what he was saying and that I should give him the benefit of the doubt. (But doesn't that still mean someone lied somewhere?)