There are big red flags popping out everywhere in your question. There are so many other professional and viable ways to handle this situation other than opening this can of worms. This situation unfortunately happens often and agents know how to handle it professionally versus 'going to court'.
Get legal counsel immediately and don't assume by any means nothing can happen to you.
I guess the best question to ask yourself is: "Why am I doing this?"
And the possible answers:
"So I could save the seller some money." OR
"Because I don't care about this agent who has worked with me for x months, he will not get paid and does not deserve to be paid." OR
"Because I really don't care what happens as long as I get the house." OR
"I could probably get myself into a bad deal by not having my best interests represented. Heck, life is short, why not?"
So, the person you are in contract with probably has the legal recourse to come after you for that 2.5-3% commission. Most agents WILL collect on both sides if they do both sides of the deal
He is giving you inaccurate information and is being unethical. It would be good to speak to the agent you signed the agreement with.
Even if your agent releases you from your contract I would be VERY skeptical of doing a deal with this listing agent in my opinion.