Life Isn't Worth It

I'm tried of trying to figure out the meaning of life.
Why should people get married when there are so many examples out there showing that cheating is okay and love is not neccessary for a relationship?
I don't believe in marriage because in my opinion it is stupid to make a promise to love and be with this person forever and either you die early and they have to live the rest of their life without you and you feel guilty about it, or the other way around.
Makes me wonder why I haven't give up on love yet.
But maybe the guy I have now will help me get over my problems and learn that life is worth living, because right now, it doesn't seem like something that a wise person would want.