How did your ex-girlfriend request to close the account? After accessing your account or just contacting their live support as an anonymous user? If she login and requests to close the account then does not matter if it's your girlfriend or you. It was requested from your account.
He did not say that his girl friend requested the Rollbit to close the account, i think she must have requested the OP, who is her boy friend) and convinced him to close the account and he agreed on that time but later he must have regret this decision and that is the reason he want to gamble and open a new account.
There seem to be a few gaps in the story. Anyways, you are breaking their ToS by creating multiple accounts. Once your attempt failed to reactivate, you should have asked support what the problem is, not create a new account. Anyway, hope you at least get your deposits back but it's up to the casino on that. Good Luck.
The gambling sites won't listen to everyone's story and excuses, they simply want everyone to follow the terms of services. If multiple accounts are ban, he should have waited the 30 days period or asked the support to enable the account earlier.