Can this relationship be saved if you don't answer the phone or send text messages?

It's possible, that's all I can say, it's possible it's just a test. The number of times you call or send text messages is used to prove your sincerity and decide whether to continue the relationship with you. It is also possible that he has blocked you and does not want to continue the relationship. If he just doesn't answer the phone or responds to text messages, and doesn't block you or change your number or anything like that, just move on, there may be hope.