when u care about a particular person, u will wish tat he/she be the 'best'.. but that's according to wat you regards as 'best'.. so to them, or to others, u might be not helpin.. this is common..
for example, when one party thinks tat somethings tat the other party did is wrong, the former will try to 'change' the person.. however, tis is normally not wat the latter can accept.. thus, when this happens, both parties might get into a small argument.. well, such arguments can be avoided..
jus look at the situation from a third person's angle.. ultimately, the main cause of the argument is because of one party's intention to change his/her partner to a better person.. thus, there's really not much reason to start tis kind of argument at all..
but yet again, most people wont like it when they are being controlled or when they are being 'told off'.. so 难免will be unhappy.. but, so, like i say before, jus look at it at a different angle..
2persons get together isnt a easy thing.. cherish the person whom cares for you much..! this applies to friends too.. it's really fate tat bring 2 strangers to get to know each other and eventually be friends..
so cherish the ppl around you..
Smile..!! =D