My Dog Is OBSESSED With My Boyfriend!

My German Shepherd Mix was like this with me. Only with teeth and biting on top of pouncing and biting.

Honestly, I don't think there is any training anyone else could have done to make it better. I am 99% sure corrections wouldn't have made a danged bit of difference, either, because he's a hard tempered dog with a high pain tolerance and if moving through the discomfort still got him what he wanted - which was attention of any sort- he was going to keep doing it. ME consistently training him that the proper way to get attention from me was to sit his butt on the ground worked.

Which was slow, somewhat physically painful, but worked.

Any attention from him of a sort I didn't like, I LEFT or crated him.

When I got even remotely appropriate behavior? Attention and, yeah, playing with him - games, tug, ball, little bit of personal play, training stuff. Then I told him to stop and he either stopped and got more love and play or he got put in the freaking crate or I went into another room. Ignoring wasn't enough since I WAS STILL THERE like a giant toy (not that... I could totally ignore him. Dog's 120lbs and there was enough pain for me to squeak, flinch, get angry/upset or whatever, all of which was a reaction and rewarding to him) Total access to me had to be removed.

These days we're at 'You jump on me/flail at me/maul me and access to me goes away no matter what' rather than giving attention to all the calm moments.

Method that worked for me:
My dog used to come running and rebound off your stomach every time anyone entered the house. This is to a lesser degree than what you're experiencing, but I started testing the waters outdoors. I approached the gate to the backyard after she hadn't seen me for a few minutes and she'd get excited, but to a lesser degree because she had JUST seen me. Still a ways away from actually touching the gate I told her to sit. When she sat I threw a treat over the gate to her and told her to sit again (if that's too stimulating, like it was for mine, instead of using the treat, I took a step forward). I'd progress to getting closer and closer to the gate while she held her sit. If she broke the sit and jumped against the gate I'd dramatically back up 3-4 steps and say "Uh-Uh"
Her favourite reward in the world was to get me to enter the gated area with her. So with that in mind we progressed slowly and eventually I was able to open the gate *cue her excitement burst* and she broke the stay, so I said "Uh-uh, Sit" and closed it and backed away. Eventually she learned that to get me to come closer she must be sitting.
When I actually entered the gated area I'd start with least stimulating level of calmness and give her a couple of pets, then I'd redirect her to a toy and toss it out into the yard for her. Where she'd rip out after it and start zooming around ridiculously until she regained her brain.
I then used the same tactic for entering the house. Then I worked on it with my roommate and she already knew the concept so she generalized easily.

Other option:
Or what happens - if you want less of a training fix - what happens if you crate her when he comes over. She can be excited, but contained. After everyone has been seated and calm and you're relaxed, release her quietly from the cage and ignore any excitement she has. If she shoots out of the cage like a rocket, you didn't wait long enough for her to relax.