If you live in a past dream, you don't enjoy what is happening right now because you will always wish it to be different than it is. There is no time to miss anyone or anything because you are alive. Not enjoying what is happening right now is living in the past and being only half alive. This leads to self pity, suffering and tears.
Wherever you go you will find people lying to you, and as your awareness grows, you will notice that you also lie to yourself. Do not expect people to tell you the truth because they also lie to themselves. You have to trust yourself and choose to believe or not to believe what someone says to you.