In the book Death and Destruction, there's a spell for protection you could use. You need to get some conjure formulas called Fiery Wall of Protection -- you get the oil, and either the powder or the bath salt. You draw a bath and put some of the Fiery Wall powder or salt into it, and you also dress four small white candles with the oil and position them around the corners of the bathtub. You light them, and you get into the tub and let them burn down. This makes a "wall of protection" and, also, it washes away any existing jinx you may have had.
Some people also like to keep a picture of St. Michael on hand when they do this, as well.
So called Gypsy magic is very unique and their curses are like non other. The entirety of their will power is directed at the victim causing overwhelming misfortune to them , the easiest way to break it is to speak to the gypsy and apologize , which would automaticaly break the curse. Another way is to get something more powerful such as an entity like a god or greater spirit to break it which is harder and can be more costly then simply apologizing. They never curse without a reason which you can apologize for.
Again , knowledge on how and what varies from person to person. I can only guarantee an apology is a sure way out.
I myself am a gypsy,dont ask how. All you really need to do is get moon water. And make a cross with it on your forehead. Even though I think your friend is lieing. I am Wicken part witch part gypsy and I know that we rarely put curses on people do to crees can see your effects and know gypsys are around.
Curses are usually nothing more than backward blessings. If you can bless, you can curse. Anyone that believes in magic cannot accept the good but deny the bad exists. They're usually far less complicated than people make it, however. Very rarely will you run into a ritual curse from an experienced magick practitioner. Most of the time, the person that feels cursed is cursing themselves through negative thinking, fears, and/or guilt and all that was done was a seed was planted in their mind, the thought that they are cursed.
When I was a teenager, I used to write on my food and possessions "touch and be cursed!" Those things I labeled with that simple sentence was never touched no matter how many sticky fingers were around. But I never cursed them either. People fear curses! And many people use that to their advantage.
There are so many ways written to "break a curse" "uncross" etc. and many more passed down from generation to generation. Pick an authentic one that your "friend" has faith in and do it. Baths are most popular for self work.
"Curses" are simply put, directed negative energy. Any of the above suggestions would work to "break the curse" should you fully believe they will. Focus on positive things. See the curse being broken, and the negativity being absorbed into the universe for balancing.
My personal favorite is burning a mix of sage, sandalwood (or frankincense) and bay leaves. It is said to be good for breaking curses. Regardless the scent of the mix causes a calming on the mind, allowing you to focus on other things. I feel most of the time that when people feel they are cursed or jinxed they actually bring more negativity into their life by focusing on it ;)
Personaly i would to listen to the gypsy first. Some might say how do i know if they are telling the truth? Any one can be anybody on the internet. If it doesnt work there are alwayz the other methods. Next i would try to apologize, but a true gypsy never stayz in one place for long. Some never sleep in the same spot twice in a row, regardless of how long they are in the area. 2 dayz. 2 weeks. 2 months. 2 years. Or until they give up their gypsy wayz and decide to settle down in one place.