Distancing yourself from those you love to "get stronger" or whatever is a terrible idea, especially when you're young. When you're young, you think you have all the time in the world. When you're suddenly 30+, and you don't know where the time went, and the people you love that you separated yourself from are dead, chronically ill with little time left, or now married to someone else because you left them alone for too long, THEN you realize too late that time passes by in a flash, and every moment with someone you love might be your last, and that you have to treasure the time you have with them.
It might feel like your pleasant days with them (or even unpleasant ones) will last the same way forever, but nothing is forever. Time and age changes and eventually destroys everything, and who knows even how long you yourself will live, or at least how long you'll live with your faculties intact?
I dislike stories like this that advocate (or at least show) separating suddenly with little to no explanation from someone because "you're burdening them" or someone's being held back, or "you have to improve" or something like that. That's a very classic Asian mindset (one I also saw in my own family as well) but one that I now know from life experience is not a good one. Nothing's more important than being there for your family and loved ones while they're still around to be there for. Leaving them to get stronger or make money to send home and all that is nice in theory, but that's time you'll never get back, and by the time you're "finished" doing all that, you might be 40+ and missed every single important milestone that you'll never get to see again.
Edit: Another "fun" thing that might happen: the kids you swore you'd be there for and worked 12 hours every day in a distant land to "provide" for are all grown up and have kids of their own, and you're a stranger to them and them to you, and come to think of it... you never knew anything about your kids because you never spent any time with them...