Would someone from the UK marry a US citizen just to move to the US?

If he is an aerospace engineer he does not need to marry you to emigrate he has the skills and qualifications needed to do that. Maybe he does love you, your friend doesn't know how you feel about one another and is just looking out for you..... anyway as long as he treats you right and is kind and loving what does it matter about his motivation, you never know this could be the real thing