Question: when a man is serious about marriage?
Answer: He is Making Future Plans. Guys don't bring up things that they really would rather not talk about. ... 
You are Invited to Every Occasion. ... 
He is Punctual. ... 
There's an Increase in Touch. ... 
He Misses You. ... 
He Only Sees You. ... 
He Wants to Live Together. ... 
He Opens Up to You.