OK, let me start this off by saying that I know all the characters involved very well. We have chatted, had coffee, killed bandits together. But whenever I try to write about any sort of love interest (something I'm sure you all would agree gets pretty important when all your characters spend so much time together,) it seems very flat.
Does anyone have any suggestions about making any sort of romance more realistic? I can't very well just cut it out.
Assuming you're not trying to force incompatible people into a relationship together, is it possible you're trying to change the natural way they express their feelings? I wasn't happy when my main romantic couple began having sex in the second chapter after knowing each other for less than a day. So much for my plan of sexual tension which leads to a perfect 'romance' love scene. But trying to make the characters do anything differently just screwed everything up. The trick is to let go of your own preconceptions about how love should be, both in life and on the page.
This is such a hard area to give advice in because each and every couple is different. Sometimes they fall in love in a single day, sometimes it takes years. Some people will readily accept and affectionately express love, others will fight the emotion and be reserved in their expression. Some couples scream and throw things at each other when they're mad, others simply go to separate rooms. I have one couple who regularly get into physical confrontations, and another where she screams and he does his best not to start laughing at how ridiculous it all is.
My characters are allowed to do absolutely whatever they want when it comes to relationships. I will revise the plot as necessary, and write whatever they do, no matter how shortsighted, hurtful, and downright wrong it is (yes, I'm talking about YOU, Rose). If I try to control them the scenes always come out flat and emotionless, and I'm too lazy to write the same chapter twice.