Should I pay for a trip to my boyfriend’s house?

Maybe it’s better to pay for it yourself first. I suggest you first ask your boyfriend about his attitude towards you and then wait and see the attitude of his parents. If your boyfriend wants to pay for you, it’s natural. , then let him pay for it. If you are not particularly sure, just pay for it yourself.

It's okay. As you said, you are just waiting and watching now. It's not certain that you want to get married, so it makes sense that the man can't provide the money.