I would put it back in place as soon as possible and tape with black electric tape, maybe add a support.
The narrow V-shaped crotch angle strikes again! Callery pear (Bradford Pear) likes to explode on itself like this too. Sorry! I wouldn’t try to reattach – cut it off. Perhaps try an asphalt sealant on the bare surfaces — you have 1/2 of the trunk’s cambium still intact. The rest of the tree will be fine. The wound will heal over in several years.
I agree with the removal idea as well. IF it really makes the tree lopsided I might consider complete removal of the tree just because of the long term aesthetics.
I ended up trimming a lot of the weight off and attempting to repair. I also need to go out and trim up the rest of the tree to hopefully prevent another another occurrence. I’ll give it a few months and judge then if the repair will work, if it doesn’t I’ll likely end up cutting down to a stump to see if the tree will sucker. Thank you so much for all of your help! I know this tree will likely fail but I just can’t give it up easily, it’s the largest tree in my yard .