More often than not, IME, fish that pair off really soon after being introduced don't always make the best long-term, bonded pairs. I've had this happen on several occasions with severums. You introduce a male, they flirt and spawn with a female, and then it all falls apart. Are they alone in their tank? It'd be best to separate them if there is aggression.
I had a turquoise male who paired to a female about three days after I introduced him to the tank. They raised two spawns together, then he went crazy and almost killed her. I let her heal for a month in a separate tank and then tried reintroducing them into a larger severum community. He immediately sought her out and began attacking her again. I was never able to house them together again, even in a 210 gallon tank with about 12 other large cichlids. He still found her and harassed her.
Your only real chance would be to remove her, let her heal up, and then introduce them into neutral territory, i.e. putting them both in a new tank at the same time with other fish. They may or may not tolerate each other.