B is still not happy with O being in the adjacent but out-of-reach paddock to learn trailer training. I've tried allowing them to be together then separating but B gets too aggressive (unacceptable and potentially dangerous) when I take O away so unfortunately potentially to B's detriment, they have to be separated permanently for now. I realize this is a bit of an oxymoron (permanently for now) but it's the horse that drives these situations. If B can show me he's comfortable with O in the adjacent paddock, I may allow a short time together in the future. This togetherness appears to be for B's benefit as O seems to prefer his own space.
I certainly don't have all the answers myself so I "phoned" a couple friends on FB and received some "I hear ya", "following", and some great feedback. It's a relief to know that I'm not the only one who has the bromance problem with my horses. It makes me feel a little more competent.
One great piece of feedback came from positive reinforcement trainer Shawna Corrin Karrasch of On-Target Training. She provided me with a link to this youtube video: https://www.youtube.com/watch?v=2CmWnGSUMF4&feature=youtu.be&fbclid=IwAR2pJYWT8TsF2IbfG2KTG5dz0-BPT0Zigtx2D6trBm9Ks15OmmSe_9-qgiY, which is about 17 minutes long then I went out and tried a few things with B & O.
The good news is that B does take breaks from pining for O and will go eat his breakfast or dinner. The bad news is that he spends a lot of time pining and pacing, which has resulted in a sore front hoof. The first thing I noticed is that B gets alarmed slightly even when I approach O's stall. So I asked O to back up so that B could still see him. B calmed down. Then I brought O out of the stall. B whinnies. I bring O out of the front of the barn and around the corner so that when B stops whinnying, I bring O into his few. B calms down. O and I do the hokey pokey based on whether B is whinnying or drops his head, licks and chews. The latter behaviors are indications of calming.
I let O loose in the paddock so that he can continue his trailer loading lessons on his own. Then I take the flag to B and invite him to target the flag. He'd really rather stare at O to see if he goes anywhere but he likes this target game so he engages and gets rewarded after he touches the flag. I invite him to touch the target in the direction facing away from O. This is harder but he understands the game so after a while he touches the flag. I leave him alone and he watches O get in the trailer.
Hard to see but O is in there eating lunch. Such a good boy. I have hope that B is going to feel better and am glad that I have access to knowledgeable and kind horse people through Horse Radio Network.