Is there anyone could suggest how to cope up from the past........

If you are the one missing someone, then I'm sorry. I hope you are feeling happier soon. I'm going to put this a little blunt but hope you can hear that I feel for you... I have felt this way in the past, after breaking up with someone you feel so lost and don't know what to do. Feel like you can't go on... Well you say "couldn't survive without each other" - you most certainly CAN survive without each other. How many years have you survived BEFORE you met this person? Well there ya. That proves you can survive without them. I have some to learn that if you feel lost when you lose someone it's because you lost yourself in the relationship. So - Keep yourself. Keep your hobbies and interests. Don't like things just because they do. Be true to yourself. And then if things don't work out you'll know that you had a great time and hopefully have some good memories and you can move on and meet new people to make new memories with.