AN alleged love-rat was caught cheating after the flatmate of a woman he slept with recognised him on Instagram - and reported him to his heartbroken girlfriend.

Jess Meakin, from Doncaster, South Yorks., was livid when she heard her boyfriend had been sleeping around - so "exposed" him on Twitter for the whole world to see.

After asking if Jess was still going out with the unnamed cheater, the stranger wrote: "I'm really sorry to have to tell you this, but my flatmate in Newcastle went out Friday night.

"[She] no idea he had a girlfriend, he never said and she slept with him.

She's just showed me a picture of [your boyfriend] from Doncaster and I said he had a girlfriend and showed her your guy's [Instagram accounts].

"She feels so bad as she had no idea and asked if I'd tell as she said you deserved to know and she's really sorry. I really hate to be the one to tell you as I don't know you."

Furious Jess then tweeted out a picture of her now-ex - adding that it was the SECOND time she'd been cheated on in twelve months.

She wrote: "Cheated on twice in one year, mate what the f*** did I do wrong?"