What do I do when my ex’s family still likes me?

Basic background of this is that me (M23) and my ex (F21) dated for nearly two years and we were talking about marriage either during or after I graduated law school which would be about 3 years. Around my birthday I started to noticed that she seemed checked out of our relationship and she admitted that the butterflies were gone along with asking me to stop talking about marriage. Her primary concern was that physical distance was getting harder for her to deal with. I got blindsided by that and she told me that she didn’t really have a reason to break up with me but that it was something going on with her. I could see that I was getting strung along a bit and a few days after my birthday I sat down with her and asked her she thought breaking up was the best for her to do. She admitted yes and that she was told it was the best thing to do by several of our friends and her family. I was pretty heartbroken over it but walked away and kept no contact and it’s been that way the past few months. Anyway certain things have just felt weird with her family members still talking to me. Her mother was very sad about us breaking up and told me to keep in contact, her sister as well told me that she didn’t want to lose having me as a friend and even the grandma didn’t know about us breaking up until a few months after. I don’t really know what to do because while I care about them I’m trying to respect my ex and avoid contact. What should I do?