in my 70's and even cialis doesn't help

Please try to honor your marriage vows.

For some of us, men and women, the sex drive can remain quite strong, even into our seventies, eighties and beyond. This can pose difficulties and temptations when our spouse has lost libido and no longer wants sex.
When being tempted you use the word “cheat” and being unfaithful is essentially just that, cheating. Even so, I have every sympathy for you as I am in a very similar situation. However, I have resolved to remain faithful but when desire becomes overwhelming there are ways to ease it without becoming involved sexually with someone else.
You will know this and if you check out: https://connect.mayoclinic.org/discussion/masturbation-at-late-age/, I am sure you will find help and advice.
E. D. is a barrier but even so this can be overcome. There are now units, similar to TENS machines designed to bring a man to orgasm whether erect or not. A Google search using a term such as Electrosex might help. Just be wise, there is a lot of rubbish out there. There is also a Reddit group with a lot of helpful advice, just filter out the inevitable pornography. Just be aware that electrode pads should not be used above the waist in such a way that the current flows across the heart and these units are a no-no for anyone with a pacemaker or something similar. These safety precautions are normally included in the instructions. TENS and similar machines are used by tens of thousands, primarily for pain relief, but also, by many others, for sexual relief.
I am not advocating this, but simply pointing you in a direction you might find useful.
Cheating will likely result in guilt and that is corrosive to ourselves and our spouses.
Tae care.

Try Lavira

@heisenberg34 Have to agree with you.

Would you be OK with her having sex with someone else because you have ED?

@soarus57 Depends on the situation. If she wants sex and your ok with it should be ok. Perhaps if you watched you would get an erection.

I am one of those that has a healthy libido but the equipment has let me down that is that rock hard penis is a thing of the past. Hope to resurrect it. I was at the urologist’s office and he suggested Cialis . Presently on Flomax, now adding Cialis has anyone gotten good results from it?

Viagra is best for me followed by Levitra. Cialis did not work. Now I have graduated on to injections of TRI MIX which definitely produces a very firm erection. You can get with Dr. RX and on the internet.

Thanks for the information

@grandmira
I absolutely recommend it. I was on Flomax for BPH symptoms after a bad urinary tract infection. Flomax made me very tired all day, almost as though I had taken a sedative. I need to exercise every day because of cardio and pulmonary issues, so I asked my urologist if I could try tadalafil (didn't know at the time that is was Cialis). I had read it accomplished the same thing as Flomax, even though it's a different class of drug. He approved, and I started taking 5 mg a day. Don't remember if it happened after one dose, but "wood" came back, and is here to stay. Hope it works for you. Definitely worth a try, even with a higher copay.