What to call a brief sentence that comes before/after the main clause with only a comma

Question

Here is my passage. I believe I'm doing it right, but I'm not sure why.

Does this have a specific name? It doesn't seem like an interjection to me, so I'm not sure why I'm so comfortable using a comma rather than a semicolon.

"Do you come here often?"
"I guess I like the ambience, I don't know."

There are some other examples besides "I don't know", but I'm blanking on them right now.

Edit: I thought of a couple more examples that are a little less obvious of a comma splice

"Truth is, I really don't like Cheetos all that much." I used to use a colon for "Truth is ..." but now I use a comma.

"I know why you know why I know that, you know." I have always used a comma for "you know" as an independent clause.

Does the question form of this fit your idea, "You're going to make that pizza, are you?" — SuperBiasedMan, Feb 24 '16 at 17:06
Let me rephrase: interrogatives are different (as are commands and interjections; I'm talking about a traditional subject-verb-predicate sentence). — Stu W, Feb 24 '16 at 17:34
Possible duplicate of and certainly answered at Is it grammatically correct to combine 2 phrases into 1 sentence?. This is called by some a 'run-on sentence' (two main/independent clauses separated here by a mere comma: a comma splice). Its acceptability is discussed in the previous article. Nowadays, this particular example wouldn't cause many people as much concern as it would have thirty years ago. — Edwin Ashworth, Feb 24 '16 at 22:57

What to call a brief sentence that comes before/after the main clause with only a comma

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