He’s not only an incredible cad — he’s incredibly stupid, too.

A married Long Island ­limo-company manager told a female dispatcher he was firing her because she rejected his sexual ­advances — and even put it in writing.

The damning text — sent by former US Limousine manager Raymond Towns­end to pretty underling Geralyn Ganci — ended up costing him and his employer more than $700,000 in legal damages and fees, court papers show.

Ganci, 32, sued Townsend after she was fired for repeatedly refusing his barrage of sleazy requests, which eventually landed her in the hospital with extreme emotional distress, her suit said.

The sex-crazed Townsend said in one text that he “had to pull over to the side of the road and masturbate thinking about me,” Ganci said in her suit.

Ganci said she was shocked and sickened by his behavior — which occurred despite the fact that Townsend’s wife worked at the same New Hyde Park company and sat near her.

Finally, after allegedly forcing her into a restroom and putting his hand up her shirt, Townsend told the resistant Ganci she was fired in February 2009.

“The plaintiff even received another text message from Raymond Townsend which has been preserved stating that the reason plaintiff was fired was because he ‘refused to have sex with the general manager,’ ” according to the court papers.

A federal jury found Townsend and his employer liable for a whopping $550,000 in compensation and damages in 2010, federal court papers state.

After months of wrang­ling over a jury verdict last year that sided with the traumatized woman, federal Judge Joseph Bianco this week finalized her award at $550,000, plus another $170,000 in ­legal fees.

Townsend, who no longer works at the limo company, did not return a call for comment.

His lawyer also declined to comment.

Ganci’s lawyer, Debra Wabnik, said, “We are pleased with the jury verdict and to have gotten justice for Ms. Ganci.”