How can I remove my desire for a relationship/girlfriend?

For at least half of my life I've had an extremely strong desire to be in a relationship/have a girlfriend and though I've tried, I've been unsuccessful and this has brought me tremendous suffering to the point where I almost committed suicide 2 years ago. I see couples in a similar age group as me every single day and this further increases my suffering. I first encountered Buddhism 2 years ago and through its teachings I've detached myself from the past and have removed my strong desire for material wealth and this indeed has removed a lot of suffering from my life, however, I just can't seem to let go of immense desire to have a girlfriend even after realizing that external circumstances never bring lasting happiness and fulfillment. How can I let go of this destructive desire?