Since I believe in it, so came out with own explanations - there are three explanations
1. You able to meet your soulmate but she/he died early than you.
2. You failed to recognize your soulmate (it's possible)
3. Your soulmate died before both of you can meet (this one so...unfortunate and sad -.- )
Maybe it sounds so silly to believe in such thing, but if you believe in it then you will encouter one. Law of attraction =)
We maybe give up..feel depressed..fall in darkness...lose hope...hate the world WHEN finding a serious relationship, but hold on that believe you may meet your soulmate. SO WHAT if you end up alone..at least you won't regret from what you did and for sure you will discover happiness throught the journey.
"We were given: Two hands to hold, two legs to walk, two eyes to see, two ears to listen... But why only one heart? Because the other was given to someone else. For us to find." - Youtuber ..lol