Why would he suddenly break up with me and through a text message?

Anonymous
So my boyfriend tried to follow a friend of mine on Instagram and I confronted him on it and then he said he didn't know her and to show him so I sent him a screenshot of it and he hung up on me and ignored me all day then ended things over a text message saying that we don't vibe well together and didn't see himself with me and what did he mean by we didn't vibe well together? Does it sound like an excuse to cover something else up?
Why would he suddenly break up with me and through a text message?
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