Aspies can often be: Amazingly loyal, honest, trustworthy, devoted, with a strong sense of justice and a desire to live in a peaceful, ordered world. This can make for a very solid, reliable partner. Our abundant quirks are endearing, as well.
Always being in some stage of being "locked inside," communication can be challenging. Your aspie may find it easier to express love or concerns in emails than in spoken conversations.
Our wonderful empathy can mean that while our cognitive empathy ( reading of body language, social cues, perspective taking etc.) might be a bit impaired, our affective empathy (feeling your feelings right along with you, once we know what they are) can be tremendous. We don't want you to hurt.
We simply may need you to say, or email in words, specifically how you feel.
ASD feels like: compassion, caged. We love, we feel, we want to help, nurture, and be a caring support for those we love. Both the reading of how another feels, and our responses, can sometimes be frustratingly inept. There are work-arounds to communicate, and to help us express our caring for you. Your patience and perseverance, I am certain, is so very appreciated by your cherished aspie.