I'm sorry to hear about that, and yes, it can be very heartbreaking, as I have experienced similar situations.
Instead of Twitter, it was Facebook in my situation. In fact, that was what led me to believe this generalization "If one acts like xyz on social media, then they are likely to be what they are in real life face-to-face." While I know it could be the other way around or not necessarily true, I've noticed the same because when I was nearing the end of my high school years, I had about 100-150 friends added, but then only about 10-15 stayed in touch with me, and diminishing after the years, then about 20-30 of those friends that added me in the past, deleted me. To me, they are implying that "You're not worth my time and bleh just an acquaintance, so not worth my time *clicks unfriend button*." As a result, I stopped wanting to have friends and started to grow bitter and resentful of social media, real life relationships and friendships, which hurt me socially as well (but that's another point for another day).
@Summer_Twilight
Yes, what you said is really true. Someone who behaves like that is not setting a good example as a Christian, which leads to me to believe that that person is a Pharisee, in other words, someone who talks about being a moral, nice person, but does not practice what he/she preaches. (I've studied the Bible before as well as attended church, had friends who were church goes before.)
This topic really floods me with emotion so I had to respond. Finally, I also want to say props to everyone who gave good advice such as if they are making the generic excuses about why they do what they do and then lying about it, then they weren't really "friends" to begin with.