<human>: They dated about a year and now engaged for another year. I know him for 5 years now, and close enough to know that he has autism, fought depression and treated for drug(speed) addiction. 

I was happy when he started dating her, and she seemed like nice person. She has a rather assertive and dominant character, which he is into, I guess. Soon, his behaviour stated to change.

I started seeing him less, which is perfectly normal. When we talked online, he was complaning that she does not approve some of his friendships, and demands a lot of time from him. A while later, it became almost impossible to see him around.

Memanwhile, I moved to another city for work, and soon they got engaged. I frequently hang out in his town, but he is mostly unavailable/unreachable. The few times I saw him, his fiancee was either asleep at home, or out of country visiting her family. Recently, he told me she made him delete a lot of contacts from his phone. Despite all of these, he says he is happy with her and wants to be with her.

Being an awkward autistic myself, I saw him having many more dates in the past than I had, I assumed he was much more successful with the fair sex. Despite his claims of happiness, I feel like he wants some help, but cannot admit it. How can I approach this?

Can you provide a brief overview of the text?
<bot>: Friend's fiancee does not allow him to contact his friends, demands all his time and attention. He claims he is happy with this.