In my case I was getting aching all around the groin and upper hamstring area. Through many many trips to the physio, private massage etc it was nailed down to upper hamstring tendinopathy, basically tendinitis. Really a running ailment but in my case my saddle was too far back, as much as 5cm so over a period of time I was Continually over stretching. I haven't fixed it yet despite a lot of trying. It seems the main way back is through lots of strengthening work with the hamstrings and core muscles, massage can help but won't fix it on its own. I haven't ridden since February apart from 10 miles round Snetterton track earlier this month.
It's hard enough just to continue with my physical job let alone try riding again.
Having said that, my club mates keep hassling me to go out for a bimble, so might give it a go even though I'm no better than I was 6 months ago.
You will fix it - but six months is no where near enough. It took me 18 months - common guideline is 12 months.
Basically you need eccentric hamstring exercises - with weights - and pretty heavy weights, and then even heavier weights.
You need to get to a gym and do hamstring curls, one legged dumbbell dead lifts - and then bridges onto a ball.
Be aware that most physio's won't recommend that stuff - they will give you some light stretches to do. The words that still ring in my ears are "Much more aggressive gym work" is required. Also if a physio isn't doing cross frictional massage and/or dry needling they have misdiagnosed and you are being treated for a minor hamstring strain.
Also bear in mind when you do get back the bike - there will be a bit of discomfort, you generally want to ride more than your ars* is prepared for. Don't confuse this with the original injury. Chamios cream and a leather brooks saddle got me through this bit.
Back to op - General groin pain IME was caused by tight hamstrings - this pulls everything out of whack - stretch those hammies every day and after every ride.