Honestly I hate both tj and Ian, they fucking piss me off.

Why, because they’ve reformed their ways and are finally pursuing a better life together?

Nah, because Ian cheated on Jo with TJ. How are you gonna justify that?

Because they were never in that kind of relationship to begin with. Jo developed feelings quickly that Ian struggled to ever fully reciprocate. At most they became FWB. Having a sexual relationship with someone doesn’t make you their boyfriend/partner.