Boyfriend broke up with me all of a sudden, in need for Advices!

I'm really struggling to process what happened and would appreciate outside perspectives.

I was in a long-distance online relationship with someone from Japan. We met on a onlien vr platform and became very close. We spent nights sleeping together in VR or on discord, talked every day, and he often told me how much he loved me (愛してる).

Just before the breakup, he:

• called me "husband fro fun,"
• said he felt a bit sad cause he wished he lived in in my country cause he really wanna see me etc
• said even though we were far apart, we were still connected,
• downloaded Telegram for me just so we could talk throughout the day more because Discord wasn't always convenient,
• told me I could message him anytime if I felt lonely or just wanna talk,
• said he had talked about me to his family and coworkers,
• and we spent what felt like a really wonderful night together, took pictures together, and were affectionate as usual. 

The next day morning was fine too, we woke up together he expressed again that he loves me and that i should feel free to reach out whenever i want to. I was busy and didn't got to message him really after that and later he was online drinking with his friends. He had previously told me that when he drinks with friends he likes having that time to himself, so I thought I was respecting his space.

The following morning I woke up to a breakup message.

He said the language barrier and cultural differences made him think we couldn't truly understand each other, and that he wanted us to become good friends instead. He also said he didn't want to lose me completely. While these reasons might be valid on paper they feel to me like excuses cause he knew about the language barrier from the start and im also learning japanese and he even said he wanted to get better in english.

What hurts isn't only that he broke up with me.

It's that I never saw it coming.

He never told me he was having doubts. He never said he was scared. He never asked if we could work on things together. He always told me everything was fine.

From my perspective it felt like he took 100 steps toward me—talking about our future, downloading Telegram, saying "I love you"—and then suddenly cut me off overnight.

I keep wondering:

• Did I do something wrong?
• Did something happen while he was out drinking with his friends?
• Was he already having doubts and just never told me?
• Was everything he said before genuine?

He still has me on Discord, VR Social platform + the group he made for us for sleeping, and Twitter, and he said he hopes he can still be a special person to me. But I feel so confused because his actions before the breakup and the breakup itself don't seem to match.

Has anyone experienced something like this before?

Can someone genuinely love you and still end a relationship this suddenly without ever talking about their doubts first?                                                                             

Also i really dont know what to do or where to go from here cause i see him posting stuff while drunk that kinda indicates that he feels lonely etc and i saw him hang out alone online so i really wanetd to join but at the same time i dont know if he want to see me tbh, hell idk if he actually meant what he said with he still wanna be friends or if he even cared about me in the first place. We also didnt talk to eachother since the break up (4days ago)

I'm not looking for people to tell me he's a terrible person. I genuinely want to understand what might have happened because right now I feel completely blindsided. Im a very open and understanding person and while i usually would just reach out in a situation like this and tell them how i feel and ask how they feel etc i think this wont work here cause of the culture differences at least based on what i read so far online it only gonna stress him and gonna make him losing his face etc.