OP, I had an EA while married.
They are all-consuming.
I have RTFT, and @IceClown speaks a lot of sense.
@DonaldTrumpsChopper, you perhaps inadvertently also make a very good point, namely that your DH has done all the things you mention, "with the exception of withdrawing from me".
Withdrawing from your partner is a major symptom of an EA. If there's no withdrawing, it's not an EA. It's perfectly normal to like (and fancy) people of the opposite sex. It's perfectly normal to have close friends of the opposite sex.
An EA is whole different ball-game (no pun intended).
The only thing I didn't talk to my EA about was my marriage (because, weirdly, it would have felt disloyal). He was, however, the first person I would text when I woke up (in a separate bedroom from my husband). He was the one I would ring to say goodnight. He was the one I would text throughout the day, for no reason at all. He is the one I told first when I had news about jobs/family etc. I used to walk the dog in the evening so I could ring him unheard. I switched the sound off my phone so my husband couldn't hear the volume of texts between us. I set up a second email account, just to communicate with EA.
I remember being in B&Q with my husband, when my EA rang to ask me to buy him something. My husband stropped off out of the shop. I went through the motions of asking him what was the matter, when I got back in the car, whilst knowing what he was pissed off about. He said I was more married to my EA than I was to him.
He was right. But EA and I never so much as held hands. Though I had endless sexual fantasies about him (my husband and I were not having sex, though I never told EA this). However, I was married and he was never going to be sexually involved with someone else's wife.
I have never loved anyone so much, though, apart from my children.
That's an EA. It is not a 'close friendship', or 'fancying a friend a bit'.
Have NC for this, obviously.