@Jaylee no, I don't think so. Never seen him without the insulin. Once he forgot to take it with him, realised 5 mins after arriving to my place and went back for it. It was still very early into the relationship, I didn't know much how everything works and I stupidly asked if he cannot take it later (after he goes back home) as the dinner is nearly ready. Again that same "are you insane?" look which he gave me when I asked if he smokes
Obviously he's not happy he needs it but he is a very responsible person and would never try to omit the insulin.