Where did it go wrong?

Talking about emotional advice or advice on the body are two separate topics for me. So I'll give it a shot and attempt to convey this properly. My boyfriend of 2 years and I had a miscarriage. We are trying to work out a long distance relationship with him starting his career and me with getting through college. We always make a point to try to visit one another every few months. I visited him in August. My period was late, 17 to be exact. We weren't trying and obviously the contraceptive I'm on failed (my luck). But I lost our baby as a conclusion. We weren't trying and I wasn't even aware I was pregnant. It's been almost about a month since my doctor confirmed the miscarriage. My boyfriend claims he feels absolutely nothing for our baby, but then he expresses some form of sadness. He knows I'm depressed because of it. That I feel guilty for not knowing due to the medications I'm on and the stress of college courses. We're fine, but that's the thing we're just fine. Not great, not good, not even happy. He's been do distant and short with me. The sarcastic mentality we both share has become more cynical on his part. He's not the same and I can't put a finger on it. He's usually so open about his thoughts and opinions. For the first time in 2 years were fighting, actually fighting. We aren't communicating as we usually do. I feel utterly alone, lost and confused. He's pulling away. I don't know what to do. I've tried taking to him, but "everything is fine, were fine". But we're not. I'm not emotional, but this situation has made me a wreck, brought out the girl in me. I need advice, honest to god non emotional advice. Thank you, ladies❤️❤️