The fact the you are seeing her name everywhere is just a coincidence.
For instance, assume that you didn't know anyone named Alyssa. Now if you saw the name repeatedly somewhere or the other, you wouldn't give much thought about it. In fact, there is half a chance that you won't even notice that the name Alyssa has been appearing everywhere.
However, since you know that girl, whenever you see the name flash up somewhere, your mind sub consciously makes a note of it. Even if you don't want to think about it, your subconscious is still making notes of everywhere the name appeared. This in turn, is making you uncomfortable since the spell you cast is indirectly related to her.
Relax, and try to ease off your stress. Forget about the spell for now, and go out with your friends and meet new people. In other words, keep yourself a bit busy because the more you are idle the more you wil be thinking about the spell and your ex and Alyssa.
Blessed be :)