A little guy advice...
If he isn't lasting very long and doesn't seem very interested in sex....one might lead to the other. You should let him know that no matter how long your love making session is, you want to be with him physically and when you two are intimate, take away the penetration. Both of you can give massages, dry hump, oral, deep kissing all over, etc. He won't feel comfortable about "cumming" early until you let him know it's okay. As a man, it really, really sucks. I don't know a single guy who wants to last a few seconds....especially a husband. But you can help him out. Remind him that you find him sexy, touch and kiss him everywhere, comment on his arms, a**, legs, etc. Believe it or not, we like to be complimented and we want our wives to want us.
I think if you implore all of these things you will have a more confident husband and he will be more passionate in bed. Hey, he might even want to get in bed and stay a lot longer!