I have it (diagnosed), DP very likely has it (undiagnosed but wants to pursue a diagnosis).
My traits are:
Sensory overload - it exhausts me
Dislike of certain textures, food wise, very rigid eating habits
Hate loose clothing, have to have something tight
Lack of empathy with most people, too much depth of feelings with others (DP for example)
I hate being touched by most people. I can't get enough of DP touching me and love having my back stroked. Can't stand DCs holding my hand loosely
I need down time and don't like being around lots of people all the time, hate crowds and noise
Processing can take a while. I need to think about something and take it in before I can act on it or deal with it
I struggle socially and can be a bit inept. The psychiatrist said I was emotionally immature
Not great with lots of verbal instructions
On the upside my hyper focus means I am highly efficient, organised and very very good at the things I can do. And I do them fast and accurately. In work my colleagues are amazed at the speed in which I work. I think it's normal and they are very slow.
My memory is excellent.
I am very loving to those I care about
I do stim. I pick and fiddle with something constantly. I wear a necklace so it's usually that I'm fiddling with.
When it comes to DP and I, good communication is key. It does not occur to me to think about someone else naturally. He told me others would think I come across as selfish although he knows I'm not, I just don't think about it. He is very good at helping me to see things as he worked with autistic teenagers in the past.
I struggle to adapt to having someone else in my space sometimes and things not being exactly how I want them (I am very neat and tidy). It's definitely a learning curve! However I adore DP so I have to learn to adapt. He lets a lot of stuff go. I usually process it much later then we talk about it. Luckily we are both big talkers.
However I am very aware I am hard work and I don't think everyone would be able to cope with a partner on the spectrum. DP and I are both very literal which helps but at the same time I can find exhausting as we have to deal with tiny errors in something I may say and if I'm already overwhelmed, I can't deal with the analysis.
Meltdowns aren't such a big thing for me, although I can feel them bubbling sometimes. I tend to shut down more.
Would your DH do the AQ test? It gives an indication and it is the test the doctors use. You can get it online. It's 50 questions. Score over 32 means it's likely someone is on the spectrum.