does he want to date around?

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so my bf and i have been broken up several times over the last month, i called all of them. i considder him a friend now, we are both single, but we act like a couple in everyway you could guess... his closest friends even call me his girlfriend. i know i need to talk to him about this but i really don't know where to start. he is also buddies with one of my good girlfriends; he got her a job at his work and she has said to me after i say something about him, "oh, i've been talking to that boy.." i say, "o ya", she says, "well, we work together! We wash dishes together." apparently, on HIS account, she just watched him work, didn't do anything like her own responcibilities. she is full of energy and very flamboyant and has a high spirit.. i've asked my him if he's done anything with her or hooked up, whatever and he just says,"ew, her forehead frightens me". haha. i wish i wasn't so jealous, but he and i have an extended, deep, rocky history throughout our year and a half relationship, so rocky that trust has been tested, lost, and we are trying to heal; we love each other so much. i HAVE confronted my friend about this too. i guess i am just too jealous for my own good. he and i are not together, but we are. it's just extremely complicated and the paranoia is starting to drive me mad i think. please help.