Is it parents' dissatisfaction to go to my boyfriend's house during the Spring Festival without giving out red envelopes?

Not necessarily. Maybe the other person thinks he is an adult and doesn't need a red envelope, but many people think that red envelopes are for children, so don't give them as adults.

And it may be that you are recognized as a family member and there will be no behavior of giving red envelopes. So you can observe more, whether the other person really likes you, and whether you can always take care of your feelings and protect you. And if you visit relatives and friends, will you introduce you to them? If you have such behavior, it should be a kind of recognition, don't worry too much.