Boyfriend stopped caling me pet names and got distant after I asked him questions about marriage. He said "Trust me." How do I regain his interest?

He said "Trust me. I have a plan. I want it all to bs a surprise. Just live in the moment." After that phone call his texting became scarce
Boyfriend stopped caling me pet names and got distant after I asked him questions about marriage. He said "Trust me." How do I regain his interest?
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