Sometimes overuse of tropes, I think, is caused by good writers doubting themselves and feeling the need to include tropes in hashtags and such to get attention. I've read good stories before where other things I didn't care for were written in, and I feel like in some cases it probably comes from this writer self-doubt. Other writers write tropes on purpose because they know it's what sells.
I personally don't like writing romances that end other relationships or possessive jealousy that isn't addressed and things like that. I like to write how romance makes my characters better, and when everything is a conscious choice consistent with the characters I do think it improves them.
Now, I have two love triangle-type jealousy issues in one of my stories that had to be addressed in my novel "Damsel in the Red Dress" but one happens before the story starts, technically.
The female lead started dating a guy other than the male lead and it led him to feel jealous, but not in a way that sabotaged the integrity of the character. The female lead is still his best friend, and he chooses to control his jealousy, acknowledging that it wasn't her boyfriend's fault he and the female lead weren't a couple because the male lead had just chosen never to confess to her for over a decade.
I think it's all about having a clear understanding of your characters. Any unusual personality switch will be shocking to readers, so unless there is a GOOD (and properly led up to) reason for it, even in romance the characters should be consistent with who readers know they are.
The second time my male lead gets jealous, the female lead is not dating the new guy yet and the situation is sort of a mirror to the first situation. But while the first time he chose to suck it up and ignore his emotions the development of the characters up to this point leads him to react differently. He still doesn't get angry and flip or go crazy. He cries, and this is an unexpected spin on the trope I think but is still consistent with who the character is, rather than resorting to the possessive jealous idea. It's kind of cliche for a relatively mature person to lose their mind over jealousy, and that's not the kind of future partner I'd suggest to my characters either, so I had to (and have to, as he still has a lot of growing to do) force my male lead (FL honestly too) to develop .
In the end, I think it all depends on the writer. Romance definitely can be done well, if it's written.
But honestly, irl, sometimes romance leads people to become kind of crazy when they used to be cool people, or leads them to cut off their friends etc. Not saying it's right, but it is realistic.
Even my leads I try to write intuitively have a whole lot of mess in their lives because of trying to make this romance work, the difference being that they aren't really taking it out on the people around them, they're mostly just frustrated with each other.
