Things will be better. More than you think. I have 36 years, and few years ago, I was completely broken, that I could not get up from bed for days, I throw up for days and become even suicidal. I went for counseling and It helped me a lot to feel better.. I guess that it has to do something with excitement, physical addiction, feelings of pleasure and hormone functions. I thing that oxytocin, dopamine and serotonin are responsible for feelings of love and lust. Moving to another city and meeting new people also made everything fade. After some time I started to see past events more clearly, and it wasn’t anymore so great, it was actually full of holes, but heart in love (or brain on hormones) is blind. The question is: what do you want? Do you want to feel pain, depression, suffering, heartbroken, or do you want to be a strong, a fighter, to get over that person, and have even bigger and better love, irreplaceable, mature, special? Wrote on a paper your possibilities: to lose years in pain and feeling stuck, or to maintain relationship with him as a mistress, a second woman, without children or family, or to get him over as soon as you can and have new relationship… you know better.. Please, don’t waste too much time of your life in pain.. Look forward to joy, love, new experiences! They will be way more stronger and better.