Hi, I'm KC88! My brother might have Asperger's - how do I approach it?

Hi, my brother is aged 30 and I have just learnt he quit his job he had for over 2years and has been pretending to work for the last 4 weeks. He did the same thing a few years ago with a different job. Looking back it appears to be a pattern as he dropped out of a college and later quit university. He has always been socially withdrawn. Does not have any friends, never goes out unless it’s with my parents, never been on holiday etc. He has suffered with depression in the past. In his early years he went to a speech therapist as he didn’t talk until around age 4/5. He used to have repetitive habits (pulling out eyelashes when he was a boy). Sometimes when we have big family gatherings I will notice he is missing and he will have disappeared into another room to be on his own for a while. He still lives at home with my parents and I worry about him. I don’t have a very close relationship with him as he doesn’t open up much. When you ask about his life or future plans he gets defensive and frustrated and cuts the conversation. When I ask how he is he says ‘fine’ and nothing more. He doesn’t make small talk and I cannot remember a time when he has asked how I am doing. He is really funny and quick whitted when he wants to be in his small circle of me, mum and dad. I apologise for how

Long this is but I really want to help him. He has never been diagnosed with anything. Do you think he may have Aspergers? Also  how would you think it would be best to approach him to try and help without him getting mad and shutting me out?