All's fair in love and lawsuits.
The suit alleges that while looking to buy Bumble, Match Group gathered information on the company and then filed a lawsuit for patent infringement.
"Match tried to poison Bumble in the investment market," according to Bumble's filing, and "wrongfully disparage the Bumble platform."
In a statement Thursday, Match Group called the lawsuit petulant and meritless.
"Last week, Bumble claimed our complaint was baseless and won't affect them, and this week they claim it is 'chilling' the sale of their company," the statement said. "We obviously think their lawsuit has no substance."
In 2014, Bumble CEO Whitney Wolfe Herd sued Tinder, alleging sexual harassment and discrimination during her time working there at the app's beginning.
Update, March 29 at 10:39 a.m. PT: Adds comment from Match Group.