To judge whether your boyfriend is playful or serious, you can observe from the following aspects:
First, observe his words and deeds. A serious boyfriend will respect your opinions and needs, will take the initiative to think about you, and care about your feelings. He will show his love and care for you in his actions, such as often taking the initiative to contact you, caring about your life and work, etc. On the other hand, if he behaves frivolously and often ignores your feelings or disrespects your opinions, then it is likely that he is just playing.
Second, pay attention to his attitude towards the future. If he often mentions future plans and visions in your relationship, such as buying a house together, getting married, having children, etc., then he is serious. On the contrary, if he doesn't have any plans for the future, or just talks about it casually, then it's likely to be a playful attitude.
Also, observe his attitude towards your friends and family. A serious boyfriend will respect your social circle, take the initiative to fit in, and show care and respect for your friends and family. Conversely, if he always ignores your friends and family or just copes casually, then it is likely to be a playful attitude.
Finally, pay attention to his sense of responsibility. A serious boyfriend will take on his own responsibilities and obligations, such as taking the initiative to share household chores for you, take care of your life, etc. On the contrary, if he does not have a sense of responsibility, or is just playful in his attitude, then he is likely to run away from his responsibilities.
In short, to judge whether your boyfriend is playful or serious, you need to observe his words and deeds, attitude towards the future, attitude towards your friends and family, and sense of responsibility from many aspects. Only by taking these factors into account can an accurate judgment be made.