Jena Frumes claims she was “disrespected” and “cheated on” by Jason Derulo. The 28-year-old model has accused her ex-boyfriend of being unfaithful during an exchange with a social media follower. Jena – who has a 13-month-old son called Jason with the music star – posted a photo of herself in a bikini on Instagram and captioned the image: “You are beautiful, you are worth it and YOU are irreplaceable. Don’t forget that. (sic)” In response, the follower said: “Worth it in what way? You’re not married, which means your child is a b****** and you’re playing the w**** role. Y’all got morals mixed …