I'm not sure I feel the same anymore, help?

So I've been with my boyfriend for around 10 months now, it's the first relationship I've had where we haven't argued and things have actually gone quite well, but recently I've been having doubts about things. I've realized that we aren't extremely similar, and while this is okay in person, we spend a lot of time apart (Long distance relationship, I see him for the weekend every 2 weeks), when we aren't together I feel very distanced. I don't know what to speak to him about and feel like we don't have much in common, and I almost feel as if he's just like a friend to me now, although I can tell he still loves me as much as ever. The other day I was having quite a bad day, and told him I didn't feel like talking, he overreacted quite a bit to this and said that he was sick multiple times and was nearly crying because he was so worried. This hasn't happened before but I know if he thinks something is wrong or I'm doubting the relationship he will stop eating. This makes me worry what he'd be like if I broke up with him, I honestly don't think he'd manage. I've been feeling like this for about a month, I've been hoping things would go back to normal but they don't seem to be. I want things to be how they used to be. Nothing has changed so I don't understand why I feel different. What should I do?

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