I am attached to my Women who is from Nigeria who is Taller than me?

shes 6''1 and she wears heels how do I get her to stop wearing heels,I get so aggrivated when we step out she gets alot of looks from men and she seems like she loves it.Shes beautiful she has the same sensual lips as Angelina and Naomi in a way she looks like her but she is more beautiful,and I dont know her personaly well enough,I just hope this attention thing from males who look at her does not go in her head and all and end up bitchy,I love her personality just as it is now ,but i found out when I was away,this guy I dont know wear the hell hes from gave her his phone number ,she discussed it with me like its no big deal how do i handle this and how do i keep her ,my best friend does not like her,he feels something is up that shes after my money that hurts me when my best friend thinks that way,but he stated things in this nature happens pretty often in places like Europe and Military men in Thialand and asia how do I deal with this ?