I might just do that. Her sister is my only remaining connection with her. In fact I was thinking of texting the sister/my landlord saying I last spoke with her Monday, although she could put two and two together and think, ah ha why is this guy contacting her on V day, is she ok? The tricky part is that my ex kept the relationship a secret from her sister. Her sister knew we were friends and maybe more. I wonder if the sister was tipped off by someone that my ex , Emily had a love interest. The only closure I'm really looking for is to learn what happened.

Also how should I react if my ex comes to the house in the future and my landlord/her sister is there ? What if my ex asks how I am and pretends everything is OK?