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How should I parse "I was going to wait until ..."?

I found myself parse this sentence differently on different occasions,

(a) (I was going to wait) until (we had finished eating), but my thoughts burst from my mouth: ...

(b) I was going to (wait until we had finished eating), but my thoughts burst from my mouth: ...

Knowing that "be going to" could be used for future events, as if it were a tense (is it really a tense?), I think I should parse it as in (a). However, sometimes glancing through it quickly made me parse it as in (b), which in my opinion is a rather logical way to parse.

Perhaps my parsing as in (b) might be influenced from a similar construct, such as:

(c) Her parents had asked her (not to have a boyfriend until she finished the fourth year) and she was still in the third.

Parsing it either way results in a similar meaning, but I wonder.
Should I stick with (a) or (b), or both alternatives are equally acceptable?