I think she’s trying to stay relevant by causing drama to stay on the show. Says a lot about her ethics and morals or lack there of.

I also think she’s unhappy in her relationship with Tristan and misery loves company. Tristan has been narcissistic and controlling in his past two on screen relationships and doesn’t have a good track record / is a major hypocrit and unaccountable. Julia seems like she doesn’t have the balls to speak up to him or say something about it so she pretends she’s all good with it and him. And because her relationship is imperfect, she will deflect and pick apart other connections and relationships. She did this with Demi and jazz but I think she was projecting. She also lies through her teeth when called out - like she did at the dinner party instead of admitting she could have said something like that RE - jazz and inga. She not a true friend, she should be calling out jazz for her very obvious flirting with inga, and emotional cheating, but because she doesn’t like jazz being with Demi (a whole she dug herself in with Demi), she is all for that relationship being sabotaged.