The easiest way is to ask yourself, if he wants to hide or cheat intentionally, no matter how you ask him, he will not tell you his marital status actively or explicitly, so you should be careful.
2. Discuss with his friends.
If you can't get the answer directly, you can learn from his friends, but you must pay attention to the skills when consulting. Inadvertently mention, don't let the other side be wary, and don't betray your friends, so the effect will be better.
3. Know the situation through neighbors
Although many people now live in commercial housing and their neighbors are not familiar with them, the sound insulation effect of the house is not very good now, and neighbors will listen clearly to what is happening around them. So, you might as well ask his neighbors to see if you have the answer you want.
4. Through his parents
If you have the opportunity to meet his parents, you can chat with them more, take the initiative to talk about his marital status, and then judge by his parents' performance. If his parents don't want to talk about it, it means that he has a very unpleasant black history.
5. The Civil Affairs Bureau can understand
The Civil Affairs Bureau knows best whether a person is married or not, but if there are no special circumstances, the people of the Civil Affairs Bureau will not help to inquire. If you have friends who work in the Civil Affairs Bureau, you can try it.
6. There will be
If you happen to be engaged in personnel file management, you will have the opportunity to learn his information, which is relatively accurate, but it does not rule out other changes after filing.
7. See if there are any children.
If a person has children, then he is married or has a high probability and should be treated with caution. If you have no children, you can verify it by the above methods, which is more secure.