The groom is denying to marry the bride after engagement.

There is nothing that would comple the groom to marry just engagement does not obligates the parties to get married .

 However A suit may lie on account of breach of promise to marry and claim for damages under section 73 and 74 of indian contract Act,but the you have to prove the breach, if you are sucessful to prove the  breach.

its god's grace that the groom showed his true colors. You have one life. choose a better life partner. Ask the groom to return all gifts he received on engagement etc.