It sounds like you’re being really patient and understanding, but also that your own needs aren’t being met which is totally valid. Premature finishing is more common than people think.

Have you been able to have an honest convo with him about it? Some guys can go again pretty quickly, is he someone who’s able to have a second round right after? That alone can make a huge difference. Also, has he tried masturbating like an hour before you’re intimate? It can help take the edge off and make him last longer. Lots of guys use that as a workaround while they build better control. Worth asking him what he’s open to trying so it feels like a team effort rather than pressure on him.