Why does my body flare up and heat up when I see my love with another guy. She's all I got and I hate seeing this. So what should I do?

You should train yourself to change, plain and simple.
She isn't yours, for one thing. She belongs to herself and is free to go anywhere she wants with whomever she wants, and if you don't like it, you stop seeing her.
Jealousy is a disease, a killer, it ruins everyone around you and you yourself.
So even though it's not easy, you have to force yourself to find more things to do with your life so that a woman isn't 'all you've got.'

Why does my body flare up and heat up when I see my love with another guy. She's all I got and I hate seeing this. So what should I do?

The only thing you can do is not put yourself in the position to run into her.
She is her own person, not yours or anyone else's.
Find some healthy interests that you can enjoy with friends and family and get over her.
It won't be easy, but you can do it.
Harboring jealousy and what sounds like a little anger is just plain unhealthy.
You will do fine, keep yourself busy and move on.

You learn that most likely she is with someone else because of your treatment, language liou used may be great if you are in the hood and don't want a real girlfriend but own a ho.

So you get over it, if she is with someone else, she is not yours anyway