I See 419 Everywhere

I think you're seeing 419 as often as you are and in the places you see it because the number is emotionally significant to you. It is emotionally significant because 419 is what your ex-lover's phone number starts with.

This is how it works:

A person sees many, many numbers during the course of a day. Most are forgotten.

Sometimes a certain number or numbers are remembered to have been seen. Generally, it is because the number was recognized as something special or unique at the instant of seeing it. The recognition helps to remember the seeing.

One of the ways that make a number special or unique is when the number has emotional significance. Why You Start Seeing Certain Numbers Again and Again describes how that works.

Something happens when a person wonders if seeing a certain number has a meaning or thinks there may be a message in there for them. It becomes even more significant. The person will remember seeing the number even more often, and it will be ever more emotionally significant because of the assumption that it means something. Why People See Certain Numbers All the Time goes into that in more detail.