Top 10 reasons why most of the twitter users might unfollow you..
# You’re A Spammer
These spammers usually the easiest users to unfollow. Always block spammers. Don’t just unfollow them. If an account gets enough blocks, it raises a red flag within Twitter and they will get removed pretty soon afterwards.
# You Only Talk About Yourself Or Your Product
It’s fair to promote yourself or your product, but if that’s all you do, you have to expect it will irritate or bore a lot of people, who are following you.
# You Use Too Many Hashtags
There are some users who include about four or five hashtags with every tweet, often tagging words that are pretty generic. It will look little tiresome to view your tweets.
# You Never Reply
Where at all possible, treat tweets like SMS text messages. If it’s open-ended or a joke, then a reply is welcome but certainly not essential. If it’s a reasonable question and you have a moment, do reply, or if you’re busy, favourite the tweet and reply later. It takes seconds to do this !
# You’re Rude
We’ll all have our own limits and expectations as to what constitutes civility, but there’s a line for everybody. If you cross it, expect to be unfollowed. So never send rude tweets 🙂
# We Don’t Share Common Interests
This is going to happen from time to time. You’ll follow somebody whose interests and opinions are wildly different or even polar opposites to your own. Sometimes this is a good thing but on occasion it’ll just irritate you !
# You’re Tweeting In A Language We Don’t Understand
It’s still fairly rare on Twitter to be followed by somebody who never tweets in English, but it does happen and will of course become very common as Twitter goes global.
# You Tweet Too Much
Tweet as much as you like, but don’t cross the limit. There are no hard and fast rules about what is considered acceptable limits. But for everybody’s sake, please, don’t be boring.
# You’re Too Negative
Negative people usually upsets us. So, never be negative in your Tweets.
# You’re Too Positive
Not every day is a great day, alright? So don’t be too positive always 
I think if we are replying to others tweet then we have less chances that other person will unfollow you……
So be active with your followers and try to taie part in others conversations if they don’t mind……..
you have 70,000+ twitter followers,so will definitely listen to you.
Cool 🙂
Keep following other people in your niche, you will surely get more and more followers. If some users unfollow you, then new followers will balance it, hence the followers count won’t be highly decreased.