In my experience, and observations of others, there's always a lot of ebbs and flows or even endings in regards to connections with friends and relatives. That's why it's important to not have all your eggs in one basket as far as social connections go. It's harder to form friendships the older we get, so you have to put yourself out there. Look into new hobbies, book discussion groups, Meetup.com groups, volunteering at a zoo, a museum, a charitable thrift store, etc.
I'm one that gives an equal amount of effort. If someone begins fading from my life, I don't call them out on it. I take it as their priorities have shifted and that's life. I then have more free time to devote to the people who are still making equal effort. I know my connections with cousins have gone back and forth where sometimes we're more in touch, and other times we've gone distant (they all live far from me, but we have had mini reunions over the years). I always keep an open door.
If you're expecting too much from one person to fulfill all your social needs, that can be smothering to them and drive them away. Anyway, I don't believe in one-sided effort. I believe you've made enough, and why should you basically be begging for effort from someone who hasn't chosen on their own to contact you? As I said, my belief is to keep the door open without prodding. Find other ways for now to meet your social needs.