Any advice on how to handle this?

About a week or two ago I was laying in bed on a mini holiday with my partner. We were supposed to stay on our holiday for 4 days but decided to come back home. Our holiday was great, done everything together, it reminded me of old times. On our last night I was emotional about leaving. I expressed this emotion to my partner he asked what was wrong and I told him I am worried about going back home. I don't want to go back to a lonely house, where he sits on his computer all day/night and I'm sitting on our bed or asleep by myself until 2/3 in the morning. He told me not to worry, things will change. Things have not changed. I go back to work on Tuesday and he goes back to work a week after me. He has stayed on his computer all day and all night, last night I went to bed by myself, he didn't come into bed until 3am. I told him that I am craving him, I want to spend time with him and he told me he is craving his computer. I guess I haven't felt this alone before. We are 2 separate people living in the same house. He wakes up, goes on the game, I make lunch and dinner, he eats and back on the game. We shower together, I go to bed and he is back on the game. Am I OK to feel sad/hurt/upset? I feel like this is ruining our relationship but he doesn't see it. Any advice?