Does he stand at the void deck on the phone for long and you happen to see him and he cuts the line? Does he walks out of the room when he answers the phone in the mid night while you are sleeping? If the answer is yes, there are possibilities that he is keeping someone outside. If the answer is no, i think one of the possibility is he is owing some debts outside. This is because you had mentioned that his occupation is a foreman, whereby foreman always get in touch which contractors and suppliers. I feel that maybe he owes a debt that's why people bugs him in the middle of the night. If he is keeping a woman outside, he will not leave his handphone ringing with your knowledge. You got to resolve this matter in a soft tone and not the other way round because the greatest weapon a woman posses is (Bao Rong).He put fire you must put water. JIa he wan shi xin mah