Adductor tendonitis (?)

Hello
I am 28 yo male.
I have been training for a long time, and had a bad 2 years in training but got back to a good situation. I squatted 150kg for two sets of 5, which were not difficult (my PR is 200kg for 4 reps), but a day afterwards one of the left adductor tendon started being painful. I squatted only 125kg the next session, but it was still painful. Kept with about 2 weeks with lighter weights, since when I am warmed up it’s a bit less painful, but didn’t push to heavier weights. A week ago, sorry for the over-sharing, I have been doing the missionary position with my gf, and it stretched it. It wasn’t too painful during the sex, but after a while it did start to hurt so I stopped that position since than. The pain after this day got worse, and I went down to 50kg, also did 3-0-3 tempo for a couple of sets, and I would say it has improved a bit. But it still is quite painful, to be honest. I tried a narrower stance, but it doesen’t seem to help, maybe even made it more painful. I’m not sure about the anatomy, but it doesen’t seem to be painful during hip extension, only during an internal rotation of the thigh, and an adduction of the thigh. The pain is really close to the testicles, maybe even under the testicles, at the tendon, not at the muscle belly at all.
Pain exist for already about 3 weeks now, but worsened badly a week ago following the sex.
Deadlift is a bit painful, I was at 125kg for 5 reps when the pain showed up, the next session I have done 120kg which was a bit painful, and afterwards I went back down to 85kg which was painful probably only at the first rep, if I kept my knees out. When I was letting the knees cave in a bit, pain arrived.
During the day it was quite painful 1-2 days after the sex, but now it isn’t, only when I adduct / internally rotate the thigh, which is not too frequent during a normal day.

What do you think may be a relevant approach here?
Do you think that NSAIDs would help?
I had some good experience with Ibuprofen in tendonitis issues during the years.