Sneaking husband

Assalamu Alaikum

I'm (25F) using a new account for anonymity. Although it's rather cliché to say but let me start by saying my husband (30M) is the most wonderful, kind, caring person. I come from a broken home and I've never felt "home" until I got married to him, he's made me feel incredibly safe and "fixed". We're from the UK.

That said, there are a few things I wish to get some perspective on. One night (before fajr) I was awoken by him getting back in bed, I assumed he just went to the toilet or went to get some water so I went back to sleep. This began to be a repeating pattern and it's always between 1am - 4am, he leaves the bed and returns later.

Now, the way we got married was through WhatsApp rishta aunties, surprisingly I actually went to high school with him and knew of his character etc so our first interaction was catching up on life since high school. The other day my BIL let slip in a joke towards my husband about his PhD which shocked me because he'd never mentioned it to me, not during our talking stage or ever since then. This was the first time I was hearing that he has a masters let alone a PhD from Oxford. For those familiar with these groups, you put your educational background in the "advert" and his did not mention any of this.

This has since made me self-conscious. I am nowhere near as educated as he is. I've always found him to be extremely intelligent and full of wisdom and throughout our marriage he has never once belittled me. I'm not very clever but he has always elevated me in that way and, he has taught me so much and has always been patient when I haven't gotten a grasp on things. But since finding this out, I can't help but feel so stupid around him. And it's getting to me, because (and I don't want to offend anyone with this) he has the looks, the educational background, the money, and is deen oriented so why did he resort to rishta aunties, he could've gotten anyone he wanted and I just feel like he settled for me? Is that a bad way of seeing things? I truly feel like he's out of my league. What can I do to combat this?

My older sister sees this as not a big deal and I should feel lucky. I already felt that I was so blessed to have him and it turns out he's even more of a catch. My younger sister feels that he's lied to me. With the sneaking out of bed and my younger sister's words I started to get suspicious about what else I don't know about him. Eventually I decided to see what he gets up to and it turns out he goes downstairs and prays for a few hours, I did this a few nights then stopped. I heard him sobbing every one of those nights and he doesn't know that I know. I have never once heard my husband cry or shed a tear. Early on in my marriage when I was talking to my MIL about him I learned that she's never seen or heard him cry since he was a teenager. During the day he is jolly, happy, playful as if nothing happened. Is this normal? I have no brothers and my father left us when we were young so I lack male figures in my life to compare to. Should he be telling me everything he feels and thinks? Do I tell him that I know?

I guess my questions are: - How do I stop feeling not enough? What are some active steps I can take to be a more deserving wife? - Do I try and get him to open up about whatever is bothering him? Or do I leave him alone about it.