Does he love me at all?

My boyfriend of 2 years has recently rented a house at the beach with 2 mates. Every Friday he leaves at lunchtime and comes home at 5am Monday morning. We both work full time so now i only get to see him after work. Our relationship has been a bit shaky lately, he was going to move out altogether but then decided he would stay during the week. He tells me he loves me but i think his actions prove otherwise. Shouldn't you want to spend your weekend with the one you love? I went to the new place last weekend for the first time and we had a lovely weekend together, he bought me dinner and seemed very attentive. Then when we got home he basically ignored me for the rest of the week. I think he thought that if he gave me any encouragement i would want to come with him again this weekend. He seems to blow hot and cold. One day he will kiss me goodbye in the morning and the next he will only give a distant hello. I am 37 and want marriage and kids. Is he just using me?