Do not wait by the phone for his call...you are worth his attention, and he is being rude and disrespectful to you if he just calls when he feels like it, expecting you to be doing nothing but waiting for him. Do not date for years on end expecting a proposal either...if you are ready and he isn't, move on.
John Green "Paper Towns"
Practice mindfulness. Live in the moment. When you're doing something you enjoy, stop multi-tasking. Y'know, checking your Twitter feed obsessively while your favorite show is on. Reading the news while you eat your dinner. Zoning out during walks around your neighborhood. We always say we want to do more of what we love, but when we do it, we never focus. Never procrastinate. "Never put anything off that can be accomplished today. Procrastination is the root of all self-inflicted suffering."
Word. Whenever I hear someone say, "If someone lets me down once, it's over," my heart breaks a little for him/her. All I can think is "S/he's going to be lonely forever." You've got to get through the shit together, and you've got to grow together, and for the love of pete, you've got to cut each other some slack!