Is my boyfriend getting bored of me?

My boyfriend and I have been dating for only a month and I think he’s already losing interest in me. At first, I didn’t want to be in a relationship with him because we only met twice and also i’m leaving the country in 3 months time. But he told me that he likes me a lot and he was pretty serious about it. He introduced me to all his close friends and wanted to meet all my close friends too. He treats my brother really good too. I didn’t have a special feelings for him at first but he’s a good guy, so i thought ” why not give him a chance?”. When we started to date, he was showing so much interest, he skipped class the whole week just to spend time with me. He wanted to be with me all the time and comes on thursday after his class ended and we would spend the weekend together. He lives pretty far away from me, so he can only visit me during the weekends. We talk on the phone often when he’s not around. Everything was fine until last week, we had a serious talk, he told me that he felt that I don’t like him as much as he likes me. So I apologised and promised to be serious in this relationship and both of us agreed to go on a serious relationship. He went back home later that day and everything changed. We hardly talk on the phone anymore and we hardly text too. Maybe few texts per day. He was supposed to visit me on thursday but he told me he’s busy with school works so he couldn’t make it and will only come on saturday. I got upset but I didn’t say anything about it. Is my boyfriend getting bored of me or am i being paranoid? Why is he acting so weird when i’ve decided to be serious with him? Should I stop being serious with him? because i’m afraid i might get hurt later.