Sorry to weigh in late here...
Brandi, silver asked me last night why I didn't respond here...I must have overlooked this thread. Sorry.
First, I am 43...and I KNOW first hand what your DH is experiencing. I assure you that this is something that strikes to the core of a man's self perception and one that should be handled with sensitivity. Having said that, I'm a transparent guy and didn't hesitate to confront it with my Dr.
The focus in the responses is on BP medication. There are other potential causes...low testosterone, nerve damage from biking, normal aging, life's stresses (generally my problem), and so on.
I encourage you each to be careful about being "kinda weird with each other". The fact is that as you age, you'll be confronted with this more often and you don't want weirdness to rule the day. One way might be to know how you'll respond before this happens and divert the activity to other mutually satisfying options. Many men enjoy satisfying their wives in other ways.
I also encourage you to not 'take the bull by the horns' on this one. Please make him feel the unconditional love that you've vocalized in this thread. But he's got to be the one to take this to the next step...
I'll add one more thing, ED medications are very misunderstood. They do not CAUSE the arousal, they ENABLE it. Despite cartoon stereotypes, the pill does not arouse you...it still requires the mental desire.
I'm sorry to make this long...I'll gladly answer any other questions you have if you want to pose them here.