Sorry if this has been brought to anyone's attention, but I attempted a search to see if anyone had posted anything about ending romances and found nothing. I get that you can romance multiple characters with no consequences, but I found myself hooked on Curie more than Piper after I had already romanced Piper, and was getting frustrated that, unlike real life, you cannot simply choose to break off that first romance.

Anyway, you can do it via console command, but some trial and error has demonstrated that it only works if you follow these steps. I should also mention that there will be a consequence to the break-up, in that you will have to lower your affinity and it doesn't reinitialize the dialogue at all when you bring it their affinity up again. You can obviously increase it again later, but you won't be able to redo the conversations on the friendship side of things. The game seems to pretend that you went that direction. Anyway, here are the steps:

1. Grab any other companion from than the one you intend to dump. Doesn't matter which one, it just has to be one other than the one you dump.

2. Save directly in front of the companion you intend to end the romance with and reload the save.

3. Bring up the console, then click on the character.

4. Type in "modav CA_affinity -500" (My tests suggest that the dumping ONLY happens when they've lost at least half of their affinity, but I guess if you have really grown tired of them, you can lower it more).

5. "Recruit" the companion and send your other one home. You should get a message that your companion admires\tolerates you.

6. Go through the relationship portion of the dialogue and sleep in a nearby bed to verify that it worked. If all goes well, the companion will revert back to the same dialogue that you had at lower affinity and you'll lose the "Lover's Embrace" bonus from that character.

Step 1 is actually critical, based on my testing. If you attempt these steps without forcing the window of where to send your other companion, for whatever reason, it doesn't work at all. It won't matter if you lower your affinity all the way down to 0, it simply doesn't work. You must "trade" companions to get the result you are looking for.