Chinese valantine's day

On this valantine's day, I am staying alone all day. It's my first time not having family, friends, not even you to keep me accompany. This day I'm doing the my job as usual, but the loneliness in my heart become is becoming bigger and bigger/stronger and stronger. I can't help to but thinking of all the things that happened between us. Once I believed that meetting with you is was the luckiest and happiest things in my life. You never knew how much I loved you at that during those years. But I could't forget the day you betrayed us. Half a year later, I'm trying to get over it and begin my new life.

Minor grammar mistakes, but overall it's good^^