Why does he suddenly need more space?

Me and my boyfriend have been dating almost a year now, I am 21 and he is 22. He recently started a new job that is very physically demanding. Since then, he rarely wants to be intimate, he overall pays less attention to me physically (kissing, cuddling, etc.) and he is always on edge. Every time I ask him about it, he says that he is just always exhausted, as we usually hang out in the evenings after work. I’m always the one to initiate sex, and a lot of the time he only will engage if it’s in the morning or a day he doesn’t have work. (by the way, the actual sex is still passionate and good for both of us, it’s just way less frequent). On top of this he just overall is more distant. Me and him used to text 24/7, and while some people feel that’s a lot, it worked for us both and we were happy with that. Now it’s spaced out texts and dry responses. I constantly try and communicate with him and want to understand if this is really just because of his new job or if there are other problems in the relationship he’s avoiding talking about but he tells me that I am over thinking and it’s in my head, and he’s just always exhausted now and needs some space to relax sometimes. It’s not that I NEED to have sex constantly, it’s more that I feel less attractive to him and less wanted by him when he turns down intimacy because I was so used to doing it more frequently. Is this just him needing space due to exhaustion and us getting more settled into the relationship? Or does it sound like BS? As a girl who’s clingy (and he also used to seem a bit clingy), it’s hard for me to understand the change in affection. What can I do to help this situation, and at least get less dry responses?

Why does he suddenly need more space?
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