<human>: Provide a brief overview of the text.

As the title says, my best friend, lets call her Mia, started dating out mutual friend, lets call him Brad. They started dating a few weeks ago, and became a couple last night. He has recently started acting strange, lying about really inconsequential things and distancing himself.

There have been several instances in the last few weeks where he has lied to her about small things that don't really matter like skipping class. He will say he's in class, when she will see him in his car or sitting with his friends. 

Today he ignored her all morning until we saw him in the library and he had to sit with us because he couldn't get out without Mia seeing him. A little while later, he said he had to go to class, but passed him on our way to get food. On the way back, he was gone. Mia saw him sitting in his car when she went to her car, and he drove away as fast as possible when he saw her. This is just an example of a few times this has happened. 

Brad is also like two different people when he's alone with her or in a group. She has told me he's amazing when they are alone. But when its in public like at school or work, he gives her a cold shoulder, sometimes avoids her, and when he is forced to sit with her and someone else like he did today in the library, he will sit there quietly and sometimes ignore everything she says until he has a way out.

Mia really likes Brad. It has been a long time since I've seen her this happy with anyone. But as any of her friends know, there is one rule when Mia is involved: never lie to Mia, because she hates being lied to and will always find out. This has really upset her, because she can't handle being lied to like that especially by someone who has made her really happy lately.

Neither of us can tell if he is hiding something, or if he's just oblivious to all of it. Mia doesn't know what to do, and asked me to ask the fine men and women of Reddit to give their opinions. What should she do?
<bot>: Friend's new boyfriend is lying to her and possibly avoiding/ignoring her, can't tell she's really upset. What should she do?