I've been there. When the going gets tough friends that only tell you what you want to hear are a dime a dozen. Save your rationlizations for them.
I didn't tell you to deny anything. Denying depression is the real dead end.
You're too old to wait for as long as it takes. Wallowing has a way of accelerating decrepitness that further feeds the wallowing.
If you believe you're in some kind of battle then the main thing to face is that you're losing. The time has come to quit overthinking and simply accept.
I have a friend that's 74 and 7 months a widow. She still cracks up occasionally talking about her husband who was one hell of a guy. Yet she's travelling the country by herself in a motorhome visiting old friends and making new ones. You'd have me believe she's in denial. I know she's not and that you'd do well to be half as "cowardly" as her. When she talks about her loss she sounds like a well adjusted adult. The vibe I'm getting from descriptions of your new life is that you could give lessons to the type of teenage girls that feed each others angst and tell themselves it's support.
Your comments about losing most interest and not wanting to get out of bed rang some alarm bells. I hope the quality of your friends is such that by now I'm not the first to tell you what your bootstraps are for. Did you tell them how you know better like you're doing here? Oh well, they'll switch to the easier path sooner or later.
The grieving that don't already have satisfying hobbies tend to make grief their main hobby. That's understandable for a few months. I'm not surprised that it's tough to get out of bed when most of what you have to look forward to is more navel gazing. I accept that some just aren't capable of turning the corner or to see it in the distance. Overindulgence in grief isn't that much different than it is for food or booze or drugs. It's your choice to shape up or continue down the wallow road.