If he's losing interest then find you a man that deserves you, he is out there! You don't have to be with a man that says he is bored and unhappy with you. Primp yourself up and take YOU on a date alone or with a friend. Smile at people just for the fun of it and say hello. Don't even think about the marriage comment now if he says he's bored and unhappy already and you are not happy with the sex. Your relationship shouldn't be all this work for you within 4 months, it should still be blissful!