Seeing the self-portrait of the girl I like in the round bed room, I was upset and asked her. She said that she went out to play with her best friend. Do you think it's possible?

How to say it! Judging from your description, you should only be in the stage of liking that girl at present, and have not been together yet. If there is no problem with the above judgment, then my views are as follows:

First, she's telling the truth, not lying to you. You don't need to rock the boat. It is normal for girls and girlfriends to take some large-scale photos nowadays.

Second, she lied. The photo was taken when she went out with other people (maybe other boys) who didn't want you to know. Then you can prove two things: 1. She lied because she didn't want to ruin your impression of her. No matter what the situation is, she can prove that she cares about your feelings, and you are more likely to develop in the future; It also proves that you shouldn't know her too well. If you know more, you should know her personality and even her daily interpersonal relationship. If you still like her, you really should pay more attention to her daily life!

I hope I can help you!