Forum:Liara DLC questions

Been trying to get answers to these questions everywhere with no luck. If anyone has already played through and is willing to answer its appreciated.

1. If I have a relationship with someone else in ME2, thats gone all the way is there a convo path that allows me to continue with Liara? If so, does this involve leaving the new person?

2. If I do the DLC early, and continue with Liara right away, does this mean i cannot pursue anyone on the normandy in this game?

3. When they say continue what does that even mean. Is it just a one time scene post the DLC ending, or must i continue to visit liara and get new convo's each time like all the other options?

4. Is there any real reason NOT to do this as early as possible? What changes if done post suicide mission?