By Sarah Tetteh Jennifer Lopez’s co-star’s ex on The Boy Next Door claimed she faked she was in a romance with him to help boost movie ratings. Melanie Iglesias claims Jennifer knew her former co-star Ryan Guzman was in a relationship, but played dumb about it in public. Model Melanie called out the mum-of-two on the No Chaser podcast. According to TMZ, Melanie alleged that JLo would ‘hold hands’ with Ryan at after-parties and act like they were an item to get people talking about their movie. Melanie reckons that Jenny from the block singer JLo knew Ryan had a girlfriend at the time. Recallin…