Im confused, what i am reading is that they do contact you, it doesn't sound like they ignore you. Sometimes people just get busy with their lives, school, work, ect....
Speaking from personal experiance i have family&friends who i don't hear from for MONTHS i don't ever take it personally because i do the exact same thing!

If you are really concerned about it though perhaps speak with them?

I hope it all works out for you{ i'm positive it will}