Metro query: Difference between 45 days vs. Unlimited Trips pass

For Metro one aka Blue line, I commute between Ghatkopar and Western Express Highway for entire month except weekends. To and fro costs ₹60 per trip totalling upto ~₹1,350. The 45 days pass is for ₹1,100 and unlimited trips costs ₹1,125. Question 1: 45 day pass says 45 single trips between two stations. Does this mean Ghatkopar to WEH and return will be considered single or two trips? Because for locals, it's always a return trip and that's where I come from hence, the question. Question 2: considering my schedule, which ticket type shall I opt for?