I have 2 boars. We got one at a time about 7 weeks apart. After the quarantine period, they took about a week to really get used to the idea of one another. My older one, Turbo, still pushes Scooter around just to make sure he knows who's boss. Rank has now been established and I think they actually enjoy eachother...in fact I know they do.
Don't believe anything you read about two boars living together being a BAD idea. I think it works out way more often than not.
There is always the option of rescuing/adopting a spayed female or a non-spayed sow and neutering your boar.
Regardless, your guy definitely needs a buddy and you should definitely rescue/adopt.
Good luck, and welcome!