If this friend is the clingy sort and calls you constantly and won't get off the phone, just state firmly that you will not have more than one phone call per day.
Fortunately, this kind of behavior would be rare; it would involve such things as visiting your house and stealing your clothes, then wearing them, following you everywhere or calling you constantly at work "needing help", using up your precious work time with flights of fancy.
"This is where I caution everybody: If your partner is abusive, if they call you names, if they're constantly tearing you down, that's verbal abuse, or if there is physical abuse, this isn't about overcoming echoism.
If your friends make fun of you constantly, call them on it.
To ignore people that constantly bug you and call you a "noob", turn your public chat to off or friends.
And your holiday won't be relaxing if people are constantly calling you.
For instance, if you want to stop calling your partner constantly, you would start by imagining the sense of calmness you would feel if you could stop giving in to the impulse, and how your self-respect and confidence would grow.
You call your friends constantly saying, "Help me, help me, help me, I'm so anxious".
Moreover, by standing when you take a call rather than constantly sitting, you can develop a routine that allows you to break your concentration from the task you're doing and give your full attention to the caller instead.
I'd say: "You shouldn't expect me to call constantly and miss you, I'm doing my own thing here and it's new being independent".
