A man told me that I am suitable as a girlfriend

Generally, this kind of expression has many meanings. Suitable for being a girlfriend is different from being suitable for being a wife. The meaning of this sentence is just to express a point: he thinks you can be his girlfriend.

Judging from this man’s words, if I guess correctly, he is a man who is very confident in his appearance or his popularity with women. And if you come here to ask questions, it means that you have a good impression of him or that you care about what the opposite sex thinks of you.

My personal opinion is: If you have a good impression of him, you can consider whether to date him based on his character and reputation. If you only ask questions because you care about what the opposite sex thinks of you, then it doesn't matter.