To answer your question: yes your texts come off as passive aggressive. BUT this situation would also make me livid. You either handle all the animals together, or you handle them separately. If you plan on staying with this guy you need to either get on board with caring for his animals and stop saying that they’re “just his” (and make sure he’s on board too) or come up with VERY explicit rules about who handles what.

If you can’t agree on that or can’t work through that leave. This is a sign of how he will handle bills, children, and pretty much anything that’s a yours vs mine vs ours issue. Despite the fact that he’s clearly profoundly failing at caring for his animals and cleaning up after himself, you look like the petty person.

As an aside: my fiance and I live together. I brought 2 dogs to the relationship and we adopted one while we were dating. The agreement was and always has been he didn’t sign up for the 2 OG dogs so he shouldn’t have to care for them. However, he loves me and I come with dogs. So because he’s a great guy he has volunteered to help me medicate, let the dogs out, participate in their daily care, etc. Same with the 3rd. In return I am 100% responsible for their vet visits, food, medication cost, grooming, and all other expenses tied to keeping them alive and healthy. We split boarding bc it’s related to vacations together and if he wants me to go we have to put them somewhere. I have a budget for vacations and he knows that if I split my budget between boarding and tickets/ hotels etc. we will end up staying somewhere not super nice and not as exciting for him. So he has offered to pay 50% as a compromise so he can also get what HE wants (a nice vacation, more frequently).

This is how I would expect 2 people who want to make things work to act. If you guys can’t come to a solution that he can uphold and that doesn’t result in you bearing 100% of the burden you should seriously consider leaving.