That being said, this could be about his Mom. Without the other lyrics there is no way to know. The reason I think it could be about his relationship with his mom is the term "misbehave". It's a word we typically associate with childhood etc.
"Misbehave" could be something Dijana picked up in her second language and used it to describe Lloyd when she caught him. Him throwing the word back at her is him pressing his point that his infidelities weren't as huge of a deal as she made it since she was the one from his point of view who drove him away. Every other lyric could be used to describe his feelings growing up as a JW, but the part about "tell me you're like this with every other man" to me is a giveaway that it's not. It's directed towards a romantic partner or interest.
Perhaps the next verse is about his parents and upbringing, which would make "Misbehave" more of an encompassing song about his life.
"We're living, I'm dying" is similar to his comments dating back to when he made the "I'm Taking a Break" video and what he told Kim and PB. That's the first thing I thought of.
So is it confirmed he is separated and when he recently said “getting divorced is the most stressful thing anyone can go through” he was talking from experience?
is it confirmed he lives in a cheap little bedsit he calls a studio (studio flat) about half an hour away from in-laws?
It would seem to point in that direction, but we really don't know. His comments have ranged from a trial separation to talking about the stress of divorce. With the absence of any information from the other party, it's difficult to say with conviction what is actually happening at the moment.
Zagreb is not 30 minutes from the in-laws. Dijana and her parents live in the village of Gornje Komarevo which is 15 minutes south of Sisak, thus even further from Zagreb. In total it's an hour and 11 minutes' drive from the centre of Zagreb to the in-laws.
Edit - I originally posted something else about his living situation, but now it's a bit clearer with Toblerone's screenshots of Lloyd's Twitter posts begging for money. Wow.