I don't put too much stock into signs unless they are very specific. I'm not sure the connection with 8 and infinity in regards to your noted soulmate. Maybe you weren't mistaken by signs but rather coincidence. If they were signs the 8 may have signaled a day or month that was critical for you to establish a relationship with him. They 8 may also signaled being on the right direction whereas seeing the infinity may have been a key that things were heading the wrong direction. You mentioned seeing these signs many time a day, and in the beginning for a potential relationship every action can have positive or negative implications which may explain why the signs alternated frequently.