any mother in the world wants the best for her son,and if the best for him in this case is you,his mother will be happy for him,in case he told his mother about you,first impression is priority one for you.
good luck with him,go and get him girl;)

im just saying this,but his mother wont accept you if you weren't muslim(due to there complicated traditional thing,which i will never understand),so think about it .