It’s no secret that Bruce Jenner has been going through a lot lately but the fact that he has been absent from his youngest daughter Kylie Jenner’s life really upsets him!

Bruce Jenner, 65, knows that Kylie Jenner, 17, ” is capable of making her own wise decisions,” but that doesn’t make him feel any less guilt over sometimes being assent — find out what an insider revealed to HollywoodLife.com EXCLUSIVELY about Bruce’s feelings of regret.

Kylie Jenner: Bruce Jenner Absent From Her Life — He Regrets It

“Bruce has been experiencing more in this short new year than he’s had to in most of his adult life. He knows he’s been an absent father for a few months to Kylie and he absolutely regrets that,” our insider spilled.

Our source also revealed that Bruce wants to keep Kylie as his little girl for as long as possible. “He doesn’t want Kylie growing up too fast.”

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“He knows she’s smart and is capable of making her own wise decisions, but he wants her to be a teenager for a long as she can. She will have the rest of her life to work and make grown up decisions and he just wants her to take it easy until she’s 18,” the source added.

“But Bruce knows he can’t control her and frankly, he doesn’t want to. He has a very strong relationship with her that’s built on trust and honesty and he trusts that she’s doing everything by the book.”

Bruce Jenner On Kylie Jenner’s Dress: He Approves Of See-Through Outfit

Bruce even approves of Kylie’s outfit choices!

Kylie attended her rumored boyfriend, Tyga‘s concert in LA on March 8 wearing thigh-high boots and a super revealed dress. Some people thought the outfit was a bit revealing for a 17-year-old but HollywoodLife.com has learned that Bruce actually thought she looked great!

Bruce thought “his baby looked beautiful, mature and classy all at the same time. He thought she was dressed appropriately for the occasion,” our source shared!

HollywoodLifers, do you think Kylie is growing up too fast? Let us know your thoughts in the comments below!

— Shira Benozilio Reporting By: Eric Mitchell