I'm his milestone
I Know " milestone" means " hito" however, how would I use it or apply in Spanish for example " I was his milestone".
2 Answers
I'm not exactly sure what "I was his milestone" means in English, so without context all I can offer is a literal translation:
Yo era su hito.
Hi Lillian
Please could you clarify exactly what you mean by: I was his milestone? Are you saying that he was trying to achieve making you his girlfriend?
Spanish natives do not often use the passive voice. They turn the sentence into an active voice.
Passive voice example sentence: I have been stung by a jellyfish
= He sido picado por una medusa
Active voice example sentence: A jellyfish has stung me
Una medusa me ha picado
You said:
I Know " milestone" means " hito" however, how would I use it or apply in Spanish for example " I was his milestone".
You cannot always translate thoughts directly from one language to another you have to translate the idea and this depends on the context which you have not really provided as Jt also pointed out! I can therefore only give you a literal and basic idea which may not translate exactly what you wanted to say as you have not yet clearlyexplained what you were trying to say in English.
Passive: I was his milestone = (yo) Era su hito (very literal, but maybe not what you meant?!)
Active: He made me his milestone = Me hizo su hito
I am not sure that the above sentence works well or makes much sense in Spanish
Before we can really help you it would be very helpful if you could explian what you mean by the words I was his milestone As an English speaking native, I found your sentence quite ambiguous/open to interpretation! I could try to read between the lines but it would be a crude (rough) guess!
We look forward to receiving further clarification! 
Corrijan mi español si es necesario, por favor 
