My boyfriend's parents said they wouldn't interfere in our marriage, but they also said it was not suitable for us to get married. What did the old man mean by these words?

I think his parents still like you very much ... it would be a pity if you just came into contact with his parents, but if you are already familiar with them, I personally think his parents have regarded you as their family and should really care about you two. If they really wanted to kill you, they should have said so long ago, and they wouldn't have waited so long to waste their son's youth, okay?