How long after dating a guy would you see he’s desperate?

So asking bc my friend just started dating this guy she met 1 month ago and they have made huge milestones within that time like the guy has introduced his family already and he spends every second he has out side of work being with her and the talk non stop and buying her gifts like concert tickets/clothes/flowers, planning there future together and really moving at a rocket pace which is concerning. But they are still in the honeymoon phase as well and think each other is perfect and constantly post how perfect the other is or say it in public when they have the chance and how god made sure they met.

i want to see my friend happy but i also don’t want her to get hurt and i honestly do think she’s still dealing with her breakup with her last guy that was two months ago that treated her very similar and you would’ve thought they were already married or about to be bc they were each other’s best friend and did everything together. but they were also together and knew each other far longer than a month and she broke up with him bc of a fight they had a fight which wasn’t handled well between them. And I feel like she’s also trying to fill a void and ignoring signs. but it’s difficult to talk to her bc she’s stubborn and doesn’t listen when her friends try to give advice.

i do love to see that my friend is happy and she says he treats her like a queen so I don’t want to say my concerns and make her think I disapprove but to me as a guy and from the background I’ve noticed from him he appears to be really desperate for how quickly he’s pushing them and my friend is the first girl he has dated allegedly.

I’ve also never been with someone that was desperate so I don't know really what happens in those relationships normally and if it’s okay if they are already together.

How long after dating a guy would you see he’s desperate?
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