Relationship OCD ? Not sure

I've read about this and it seems to be where you're unsure of yourself and the other person. Is this always the case?

Bit of background. Got a LONG history of anxiety/depression - on and off meds etc for 20+ years. Married 2)+ years been together nearly 30 years.

Yeh we've had our ups and downs in our time but generally good.

Every couple of months I don't know what triggers it but I get an idea in my head that my wife has been unfaithful in the past. I remember something she said or did maybe 10-15 years ago. Nothing concrete or definite. Shes the type though to do something which is harmless but could be misconstrued then say "what've I done" and not see that it could look bad.

In the past we've had chats and shes sworn on our young daughters life that shes never been unfaithful. Of course, well aware that being paranoid and badgering her is not a good thing.

Then it'll pass and it won't bother me for months and months. Its weird.

I do try to separate myself and say to myself, yes ok this is not real, this is all in your head. And try to say the old saying "go with your gut instinct" which 95% of the time doesnt worry about only when I'm having a bad spell.

Does this sound typical?