Really, people try their very best with these sorts of cases and everyone is in your boyfriend's corner right now. Try everything have told you and one of them is bound to work. Chances are, he will get taller as his age progresses, but now is an equilibrium stage. It happens.
he wants to get taller really bad
Hi,
Yah, 5'10" is by no means a low height. If you really want to know if he could grow more, he can consult an Endo, who would be able to tell from an X-ray of the wrist if he would grow further or not.
Solace
Good morning or evening or day or night or afternoon and hello. My name is Hamed Khatiz and I am also always told I am too short. Firstly, 5 foot 10 inches isn't too bad. I am 5 foot and 8 inches and I am 16. The thing is, is your boyfriend happy to be 5 10 or is bothering him? Answer that question and then think.
I guess you can have a check of the hormones in your boyfriend's body and also a thyroid and pituatary check. If everything comes up normal, then sometimes people grow a kilometre in the blink of an eye and then completely stop. Ask his mother, how much has he grown before the 3 years he has stopped? It's called a growth spurt. A bjillion metres one year and nothing the rest. Also, there are some sports out there that can promote growth. Swimming, basketball, look it up. But the bottom line is, don't worry too much about your boyfriend's height, you probably wouldn't hesitate to kiss him going down on your knees because it sounds like you really love him and care about him. ;)