WIBTA if I had affairs

For context: I (71 year old woman) have been married to my husband (71 year old man) for 43 years, the last 11 of which have been without sex. To his credit, he is always willing to give me a "one way" (yes, that's exactly what it sounds like), but I want the complete experience. He is impotent, but, there are a bunch a meds he could experiment with, but hasn't. We've been seeing a therapist for nearly 2 years, with the idea of getting our sex life back on track. He says he wants to have sex, but his actions (or rather non actions) suggest differently. Two months ago, the therapist suggested he try one of the meds and masturbate and he still has not done so. (Or if he has, he hasn't shared that info with me and if it did or didn't work).

I, meanwhile, have basically been forced to masturbate over the last 11 years. It used to take the edge off for about a week, but not anymore. It takes the edge off for only a day, or two. In the 43 years we've been married, I have not had sex with anyone else. Frankly, I am at the end of my rope and this is the only thing I can think of as a solution.

One more thing: for those who think maybe the reason for this is that I've gained weight, I haven't. I gained a lot of weight earlier in the marriage, but now weigh less than at any time as a adult. I believe the last time I weighed what I do now, I was in high school.

So, Reddit, would I be the a hole if I had affairs?