Contrary to popular belief Bruce SHOWS love.
He just.. has a very.. concerning way of expressing it.
He never really said it out loud.
Dick coaxed him into being more vulnerable, but afterwards he was mostly showing it through acts of service, gift giving, quality time or a few words they’d know was affection only if they knew his backstory and his thought process- a minor detail he overlooks. Literally everything but verbal affection, because Bruce couldn’t even fathom saying it. He didn’t know how. How could he even begin to express the amount of love he feels for them? So much so that if he tried he wouldn’t find the words, in any language even beyond this planet.
Martian Manhunter once peeked in his head while the other was drunk tired, bragging about his kids and had to sit in a dark, silent room for days afterwards because he’d never seen so much light, or felt the amount of pride, guilt, happiness, gratefulness and awe over flooding every one of his senses.
They were his light. His heart. The best parts of humanity that told him he was doing something right. They gave him hope.
But with having such expressive friends like Wonder Woman and Superman, he was slowly learning how to try.
When Jason goes missing for months (undercover and rioting) - all it takes is Bruce ending a voicemail with “on patrol- just remember I love you” for him to come with a bazooka ready to kill whoever was hurting Bruce.