<human>: My SO (M21) is my best friend. We've been through a lot together in the past three years, and we spent nearly every day together, without getting bored of each other. 

One of the main problems we've had is secrecy, as we come from different, equally strict cultures. He's moving back to Canada tomorrow (I'm in Australia) to be with his family, and with that, ending our 3 years of heaven. 

I feel like I'm breaking apart inside, like I'll never be happy again. He's my first love, and I don't know how to handle it. 

I don't know what I'm asking you, or what I expect from this post, but I just needed to write everything down so I could stop crying, just for this minute.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: My best friend, also my significant other, is leaving me forever tomorrow, to a different country because of different beliefs. I feel like my world is coming to an end.