These are not "cliches" but structural engines. Subvert them by changing the genre or character traits.
A strong romantic plot is driven by more than just physical attraction; it relies on the internal transformation of the characters.
While external forces (disapproving parents, war, distance) provide tension, the most heartbreaking romances are hindered by internal flaws. This is the "lie" the character believes about themselves. Perhaps she believes she is unlovable, so she pushes him away. Perhaps he believes vulnerability is weakness, so he refuses to commit. The romantic climax isn't just a kiss; it is the moment the character finally sheds their flaw to let love in.