It depends on the person, there's no one size fits all. My ex boyfriend had Aspergers and I couldn't deal with the selfishness. He became obsessed over things easily, one month it'd be playing football, another it'd be entering 5k races .. but whatever he chose each time would be all-consuming. All of his time and money went on these fleeting hobbies, and he didn't have either time for me or money to save for the future he claimed to want with me. He wasn't good at being able to tell when I was upset, and was always confused when I said I wanted to spend more time with him, he said I should get a hobby too. I had two hobbies; one evening per week each, and tried to compromise to say we should both do our hobbies on these nights then spend time together other evenings. He would never budge on the need to engage in his hobbies daily, and when he WAS with me he was on his phone researching his hobbies.
That's just my personal experience, and is by no means representative of all (or maybe any!) other people with Aspegers.