Android: SQLite GROUP BY

In my application, I have a database table containing chat messages,like below.

|---------------------------------------------|
|message      | from  | to   |time
|-------------|-------|------|----------------|
|Hello        |user1  |user2 |2015-2-26 1:15PM|
|-------------|-------|------|----------------|
|Watsup       |user2  |user1 |2015-2-26 1:25PM|
|-------------|-------|------|----------------|
|Hows u?      |user3  |user1 |2015-2-26 2:15PM|
|-------------|-------|------|----------------|
|Im fine      |user1  |user3 |2015-2-26 2:35PM|
----------------------------------------------|

In my messages page I want list messages from all users. In this condition assume, "user1" as log-inned user,

Currently I am using query,

SELECT * FROM table GROUP BY from

and I am getting output as,

    |--------------------------------|
    |user2                           |
    |Hello                           |
    |--------------------------------|
    |user2                           |
    |Watsup                          |
    |--------------------------------|
    |user3                           |
    |Hows u?                         |
    |--------------------------------|
    |user3                           |
    |Im fine                         |
    |--------------------------------|

What I want is distinct rows (like all chat apps),

|--------------------------------|
|user2                           |
|Watsup                          |
|--------------------------------|
|user3                           |
|Im fine                         |
|--------------------------------|

So, how can I write a sqlite query to fetch rows like this?