Wah How to use Thought + Could / Would for suggestions.

There are many different ways to make suggestions.   
    Wah How to use "Ought to"
    Wah How to use "Should"
    Wah How to use "Had better"
    Wah How to use "What about...?"

We can also use Thought + Could / Would to make suggestions.
    I thought we could go out together on this Saturday. 
    ( = Why don't we go out together on this Saturday.)
    I thought we would have a 5-minute break. 
    ( = Let's have a break.)
    I thought we could take a vacation in Tokyo next month. 
    ( = Let's go to Tokyo for our vacation next month.)
    I thought we would go by train instead. 
    ( = Shall we go by train instead?)
    I thought we could go to the movies after this meeting.
    I thought you would help me for this job.
    I thought we could have the table over there.

I thought we could go to the dinner tonight.

Wah How to use "Was / Were + going to"

Was / Were + going to is sometimes called "the future in the past."
It's often used to express disappointment or anger.

• You told me they were going to play my favorite song!
• I thought Wah Wasabi's website was going to be interesting, but it's really boring!
• I thought you were going to help me.
• He told me this examination was going to be easy.
• You told me it was going to be ready on Friday.

As the song "I Was Gonna Marry You" by Tristan Prettyman:
"I don’t even know the truth.  Yeah we were fine, yeah we were fine.
Then all at once you changed your mind and I was gonna marry you.."

Note: I was gonna marry you or I was going to marry you.