"My soul, wait thou only upon God; for my expectation is from Him." (Psalm 62:5, emphasis mine)
There comes a point in our walk with Christ where those who buoyed us in time past are not the ones the Lord would have us look to at present. This doesn't mean they're not the same person they've always been, just that you've crested a point from which they held a piece you needed and now...! There are other realms in which God would have you walk. Again, not that they're not still in your circle, just that your sphere has expanded.
"He that keepeth his mouth keepeth his life: but he that openeth wide his lips shall have destruction." (Proverbs 13:3)
Because after a point, continuing to open up that part of your heart, repeating those things that could've been fully healed with silence, will actually prevent said healing from occurring. And moving forward, unless the Lord deliberately wants to continue referencing the wounds, wisdom says to keep quiet. You'll know. If you listen for the still, small voice of the Holy Spirit, you'll know when a channel is meant to stay off. Even those who are still open to hearing what's going on may not know it's time to stop referring to the thing in question, but God does. He wants your heart to be healed and whole so that you can continue to walk before Him in the ways He showed you. Some people come and go, it's just the way it is.
"But I rejoiced in the Lord greatly, that now at the last your care of me hath flourished again; wherein ye were also careful, but ye lacked opportunity." (Philippians 4:10)
But this isn't to say things don't come around. After you walk a while with your newfound strength, you may also find the wound threatens to reopen. The enemy may still try and stir up something you thought was dormant, if not dead—in the best sense of the word. God sees the deep reasons why aspects of our lives again come under the microscope. And if the person(s) who helped you aforetime aren't around for whatever reason, you're sure to be comforted by God in ways you might not expect. God delights in surprising us and the more you walk with Him, the more He's able to come up behind you and shore you up.