Ok MisaOnyx...here's what happened.
You did a bad thing. You tried to break up a guy from his girlfriend. That is not nice, or right, or good. It's selfish. Why are your friend's feelings more important than the guy's? Or his girlfriend's?
When you cast a spell for selfish reasons, frequently it will backfire. I am not saying this out of judgment...just personal experience.
If you are going to use magick, I highly suggest you take a closer look at what you are doing before you do it. If it is selfish or hurtful (your spell was both), it isn't a good idea to use magick to do it.
There are plenty of magick users who will disagree with me. That's fine, they can feel free. I am saying this because in my lifetime I have NEVER seen a selfish spell like that work without backfiring. Not ever, not even once. Without fail, they have ALWAYS caused negative side effects...and usually they don't work.
That sounds like what happened to you. If this guy has a girlfriend and he's happy with her...LET THEM BE HAPPY!!! If he's not happy with her LET HIM DECIDE THAT!!! What gives you the right to make decisions for someone else? Nothing gives you that right...not magick, not infatuation, not love...nothing.
If your friend really did care about that guy, she would not be trying to meddle in his love life. I've loved men who have been with other women...know what I did? Nothing. There are literally billions of people in the world to choose from. Why hurt people just because you are too short sighted to see that?
I hope you have learned a lesson from this. I understand why you did it... I did a selfish love spell myself once, a long time ago. Guess what? It did not turn out well. Please try to keep this in mind and don't delude yourself into thinking this kind of thing is ok. Too many people do that.