We being human being's mostly fell in love with someone at a certain time or age in life. But we all get love is next to impossible. As such we miss our loved one's when being alone . what comes to your mind when you miss your loved one.
I try to recall the good memories so, I won't feel sad. There will be more happy memories with your loved ones if you have spent your life wisely. So, While your loved ones are still alive, express to them how much you love them.