Usage of 듣다
What is the meaning of the verb 듣다 (I think it's that verb) in the sentence
여자 친구 때문에 돈이 많이 들었어요

or in
왜 돈이 많이 들어요?

Question

Usage of 듣다
What is the meaning of the verb 듣다 (I think it's that verb) in the sentence
여자 친구 때문에 돈이 많이 들었어요

or in
왜 돈이 많이 들어요?

Answer

The verb used in your sentences is not 듣다. It is a verb 들다 which means to cost, to take(time, effort, money, etc). 
 
돈이 많이 들다 It costs a lot of money
시간이 들다 It takes time (= 시간이 걸리다)
힘이 들다 It take hard work
노력이 들다 It takes efforts