Sean Ludwick, 41, managing partner at Black House Development, allegedly used a key given to him by ex-girlfriend Lana Trevisan, 40, while they were still together to enter her apartment while drunk Feb. 17, the New York Post reported Tuesday.
Ludwick allegedly painted penises on his own artwork at Trevisan's apartment and dumped a large amount of paint on the floor.
He allegedly used a knife to etch the words "studio art" on two stools.
"I became unhappy when I found out she was having an affair," Ludwick said prior to a Monday appearance in Manhattan Criminal Court. "I augmented my work to reflect my emotions at that moment."
Ludwick allegedly used Trevisan's computer to send lewd emails to executives at the woman's company, alleging she "has engaged in relationships with married men, including her current supervisor," the criminal complaint states.
Ludwick is charged with computer trespassing, aggravated harassment, criminal mischief, stalking and impersonation.