I isolated myself a lot because I felt it was better that they didn't have to go what I went through. Not because I felt they were going to, because they didn't understand, no matter how many times I explained to them, so in came incredibly pointless advice like it was something I could recover from easily like a cold.
People don't understand a mental illness really until they've experienced it themselves. And it's really ****ing tough because when you are surrounded by people who are ignorant (not always in a bad way) it makes you feel worse about it.
If they were good friends, they would stick by you and support you. If you feel like you are losing them, tell them, and if you need a break, then say, and message every so often to say that's you're doing okay.