I had very little interaction with my own parents after I moved out at 18. During college, I went home to visit once or twice per year between semesters. I lived about 8 hours away by car. We spoke by phone maybe once a month. Over the years, this dwindled down to one visit every 2 or 3 years and a phone call 2 or 3 times per year. Neither parent ever visited me in Texas. It was always expected that I would travel to them, which was understandable since all the family lived in that area. But it got really old once we had kids and careers... and other places we wanted to spend our time off. The reality is we just never had much of a relationship after I moved out. I wish that had been different. There were no ill feelings either way. That's just the way things evolved.
Not trying to call you out, but this reminded me of our situation "back in the old days".
When I moved 1200 miles from home after college (1978), I felt it was MY obligation to travel home periodically, so I did 3-4 times per year (when single). We also talk by phone once a week, taking turns who would call and pay the long distance charge ($0.10/minute on Sundays).
Within a year after getting married in 1980, we actually moved to within 50 miles of my parents, but were now 1200 miles from hers. We also now had DS. So, now we had weekly phone calls with both sets of parents, and at least 2 "obligation vacations" per year, going back to visit as a family. DW and DS would usually go alone another 1-2 times per year. We would usually see my folks about once a month, on average. Later, we moved back close to DW's parents, and then the calls and trips were in the other direction.
This all just seemed normal to me. We were the ones moving around, we should be the ones to put in the extra effort for face to face time, so we did.
Side note: DW's sister and husband (and son) moved about 1500 miles away 4 years ago. While they talk often, she has not been back to visit her mom in all that time. We did take DMIL out to visit them one time, but she has had it with flying at 89, and will not travel there, or anywhere, again.