they’ve always been wound a little tight???????
MIKE: So is, uh, Rex gone for good?

SUSAN: I don’t know. God, I hope not. I mean, they’ve always been wound a little tight, but I’ve never seen him like that. Then again, who am I to judge?

- Desperate housewives

Question

they’ve always been wound a little tight???????
MIKE: So is, uh, Rex gone for good? 

SUSAN: I don’t know. God, I hope not. I mean, they’ve always been wound a little tight, but I’ve never seen him like that. Then again, who am I to judge?

 - Desperate housewives

Answer

If somebody is wound a little tight, it means that they are often tense and nervous - the opposite of relaxed.

Answer

wound tight= highly strung/nervous type of personality

Answer

I think it means that he used to be hanging on her :)