I have to disagree with almost everybody on the forum. My horse likes being alone. He gets stressed out around other horses and tends to want to fight them. He is very territorial. I've owned him for almost 13 years and I've only seen him get along with 2 or 3 horses over a fence. He killed a dog...gave a goat a concussion...picked up a cat by his mouth and threw her out of the barn...not kidding. He loves human contact...food...and fresh air. That's all he needs to be content.
Unfortunately Im about to buy a 2nd horse...they will be in different paddocks. If you plan on keeping a loner...you need to ask the sellers if the horse can cope with it. Some love it...some freak out. You have to know the horse before you buy.
By the way I agree with Northern...leave the girl alone...I hate when newbies get on here and people get all up in their business about horse owning. We were all first time horse owners and one point in our lives.