You probably don't need us to tell you that sometimes, relationships just don't work out.
See also: Five online dating profiles to avoid
See also: Safe online dating: How to check up on someone before you meet them
And you also probably already know that breaking up is hard to do.
And it's even harder to draw a line under things these days.
With so much easy access to online information and social networks, it's very easy to spend your whole time obsessing about what your ex is up to, as this video shows.