I don't know what to do

Im a guy and tbh-- what i was taught since i was a baby by my father was to never make your partner/girl/wife/etc cry. A guy who doesnt realise how sad you are and /from what i just read/ chooses games over meeting you, or probably has too much of an ego to treat you the same with friends as you two are alone, shouldnt be kept. You say you are crying every night, which isnt healthy. As a guy, "cuddling on a daily basis" can honestly get a bit tiring, but if ur bf doesnt even do enough for you, then you can talk it out. But, instead, I'd focus so much more on the bit where he acts totally different around you with friends compared to when youre alone together. Thats a jerk move, and its something a boy would do. I don't know how old you are right now, but a boy is only human when he is a man. A boy is incapable when he hasnt even matured in the mind yet. Take this from a guy, your relationships is unhealthy. Crying every night is obviously not a good sign. Break it off, leave it, dont hang on to something when its crushing you.

I had to do some stalking in the comments below there and I don't have any experience but like what they told you, I say leave him. My cousin married to a gamer and they had a kid but he never gave attention. And I don't wish this to happen to anyone, gamers are stupid if they're like that, I mean if they have nothing but their games and no life so just leave them.
And don't think like you're being hated, I was like you and still sometimes I suffer from depression because yeah I think like you but now I tried to love myself a little and yeah I made friends online, because online friends even if they left you, it doesn't hurt much as when someone leave you in your life like you see them, I've experienced this. And also, for me online friends stay longer, I have one I've known since 6 years now maybe and we're still best friends but online. . And I know few other but I just talk to them from time to time because I feel that I'm annoying person and one of them said before that she likes to have some space like I shouldn't talk to her 24/7 so I just talk to her once in a while or whenever she talk to me and I just tell them to reply whenever. .
Feel better and do what you see is the best for you hun, don't think too much and cry but don't kill yourself crying over a stupid person because you'll regret it ><

leave him. there's no details needed. leave. if he chooses video games and doesn't treat you like a princess in front of his friends, leave. he's two faced. dump his stupid .

You really didn't give much detail in your description so it's hard to tell what's actually happening and give good advice.
But one thing I know is: If he's insulting you in front of others rudely, he's gotta go. That's just not acceptable.
The rest: you're not giving much detail on exactly how much time he spends with you vs. how much he spends with others. Bc not all couples wanna hang out with each other 24/7. I know my sister had ignored her boyfriend when it came to some stuff she really needed to do by hersel so Yeahp! And also, gamers are a whole nother field of attention levels. You can't expect him to put down his game bc that's what gamers are known for. But also, he can't shut you out 24/7. The balance is more difficult to find but maybe just watch him play games? Do other things with him to support him but know that he needs to pay attention to you sometime at least? These are all just my first thoughts jotted on paper but Yeahp! Good luck! : D