Agreed.
According to comics -
Lana Lang always liked Clark Kent, even when he tells her about his super powers (which then implies that he is Superman.) Lana does not care about whether he has those Super powers or not, in other words even if Clark loses his Super powers (someday for some reason) and becomes an ordinary human Lana Lang still loves him, but the problem is Clark Kent has no such feelings about Lana, to him she is just a close friend.
Lois Lane is completely in love with Superman while she treats Clark a s a friend and a co worker at Daily Planet, and Clark Kent beings to like Lois but the problem is that he wants Lois to like mild mannered Clark Kent, just as much as she does Superman, which she cannot so he can never reveal his true identity before her.
I think it is lot more complicated than a simple triangle as for a Triangle there are three personalities but here there are four (Lois, Lana, Clark and Superman.)