People: Harry and William's Relationship Dynamic Will Never Be the Same after Megxit

The personal issues underlying Prince Harry and Prince William's relationship have significantly changed the brother's bond since Harry's exit from the royal family.

The world got a closer look at Prince Harry and Prince William's strained relationship when they appeared together with their wives for the Commonwealth Day service at Westminster Abby.

It was Harry's last royal appearance since making the announcement that he and his wife Meghan Markle would be stepping down as senior members of the royal family.

Their reunion was also heightened by the fact that after months of tense negotiations over the couple's departure, it was the first time the Cambridge's and Sussex's appeared in public together.

The couple's receptions were awkward at best as they all gave each other a quick "hello." It is reported, although William turned to give his brother a nod as he greeted him, Kate Middleton avoided any eye contact with them.

According to PEOPLE, the tension between William and Harry first emerged in 2017, when Harry announced that he wanted to marry Meghan after dating for less than a year.

William, who dated Kate for eight years before tying the knot, cautioned Harry about moving too fast, which left him feeling hurt and angry by the reaction.

The tension between the brothers was more evident when they separated their households and Meghan and Harry moved 25 miles out of Kensington Palace to Frogmore Cottage in Windsor Castle. Sharing how their relationship is "forever changed," a source said:

"They won't get back to the way they were. Harry is looking straight ahead at his future with his family. He's not looking back."

In a rare public confession, Harry admitted in ITV's documentary "Harry & Meghan: An African Journey" to having challenges in his relationship with William, when he touched on a possible rift

, "as brothers, you know, you have good days, you have bad days."

Royal biographer Ingrid Seward, who knew Princess Diana revealed to PEOPLE that Diana had always encouraged her son's bond, saying, "remember you always have each other, and I want you always to stick together."

As the Cambridge's and Sussex's left the Commonwealth service, it was apparent that the couples did not say goodbye to each other.

However, all hope has not been lost since Harry's move to Canada because sources have confirmed that he and William have been communicating regularly on the phone.