Get an x-ray to confirm the diagnosis, although the range of movement test is usually quite accurate.
I have had hip arthritis but I’ve also had a quad tear that caused horrific groin pain.
if it’s osteo, you need to do all you can to build muscles and tendons to support the joint. Don’t stop moving - do as much as you can. Not only will it help with strength, it is important to the production of synovial fluid that eases hip movement.
If you are having a bad day with weight-bearing exercise, do something in water: swimming, aqua aerobics, or aqua yoga, my gym runs a specific aqua class for lower body strength, or even just walking (forward and backwards) in deepish water helps.
I strongly recommend this if you have a Nuffield gym near you https://www.nuffieldhealth.com/about-us/our-impact/healthy-life/joint-pain-programme . It’s incredibly over-subscribed but worth going on the waiting list.
You may find supplements help; I never did, but friends swear by turmeric. Consider, if you haven’t already, HRT.
If it is osteo, it will get worse, sadly, and eventually, when it gets to be bone-on-bone, you’ll need a hip replacement. You will want to put that day off as long as possible though, which is where keeping moving comes in.
I am one year post new hip, and despite some complications, there’s very little I can’t do now. I don’t run - although I’m told I could - but I do still do lots of hill-walking, go to the gym, chase grandkids, cycle, garden, whatever.