| | Re: not just too much sex but wife CONSTANTLY want attention
This is not normal or healthy behavior, both b/c she seems to have no inner emotional resources and b/c it is putting all of her eggs in one basket, you. Does your wife have any history of sexual abuse? That, in addition to the abandoment fear already mentioned, would be worth investigating with her.
It is time for you to set boundaries and to insist that both of you explore separate areas of interest/fulfillment. She needs therapy first, though, so that she simply does not look to replace your attention with that of someone else.
Encurage her to take up a hobby and get counseling focused on why she is so emotionally needy. She might become too obsessive about a hobby if she does the one without the other. If she likes to feel valued, volunteer work might be worth investigating. Let her take some of that nervous energy to a good cause.