I don't want to get married until my S.O. starts contributing to a retirement savings
How long have you felt this way?
I told him my point of view last night.
Taking you and your significant others future seriously is admirable. Unfortunately, not everyone can afford to put money away for retirement. How did you boyfriend take the conversation topic?
He quit responding to me.
You did nothing wrong. His response doesn't bode well for the future. Ghosting someone for bringing up a difficult subject won't work for long in a marriage.