You say she taught you sex isn't important? Unyet you seem disappointed because she stopped talking "dirty"? I'd say you may want to take a deeper look at whether you want to make love with her or just have sex?

Also you say your sex relationship hadn't been what you'd hoped for? sounds rather imature and selfish to me? I think unless we had the otherside of this tale its hard to say. I would imagine your wife has an whole different tale to tell?