However, you will also already know it is not a simple as that and unless someone has been there, either as the obsessed or the obsessor, they will never know the sheer intensity and frustration involved.
You have already made a positive step by admitting you have an obsession, the fact that it is a person rather than something inanimate, say like being a Trekkie for example, is almost irrelevant.
The problem remains the same and getting over it requires as much effort as being obsessed.
Being obsessed will affect relationships with other people in your orbit by taking up so much of your time and when you do find time for friends and family the quality will be diminished by your lack of attention.
Being obsessed is also tiring, mentally as much as physically, as sleep is hard to come by and every waking moment is taken up with the object of your desire.
To counter all this you need to take charge of your emotions and feelings. Try to step back and assess what it is you need to do and then put as much effort into breaking the cycle of obsession as you waste on the problem.
Give yourself a new goal as we are all motivated by individual needs, which, according to Maslow’s hierarchy of needs, and these are physical, security, belonging, esteem, learning, aesthetics, self-actualisation and transcendence.
You need to aim for transcendence which will take you from being motivated by being with or seeking approval from one individual to making yourself a happy individual with a more rounded approach to yours, and other people’s lives.
By focusing your mind and energy on an equally, or even better reward, you will slowly but surely put the previous obsession further and further behind you.