Plz give me a valuable advice rather than bad comments?

hey guys i work in one of my ex-staff members clinic..all the while he was good,as a teacher he always supported me guided me and he was the one who offered me this job ...its been 6months everything was fine,now from past 1month he is behaving weird..he used to come and see his clinic once in a while but he used to personally come and give my salary..now he is hardly coming to clinic even if he is comin he is comin at those hours wen im not der.........and today he came in the morning and gave my salary to the secretary saying that give it to her..i dont know whats his problem..im a 22yr old,pretty looking girl...and he is a 35yr old married man with a daughther...initially he even flirted with me like any thing even though i said no he dropped me at home..now he says if i come there everyday people will say that im spending too much of time with you its not that i dont want to spend time but still...i dont know why guys i have a feeling that there can be 2 reasons 1 he wants to get some one else in my place so behaving weird(cuz sum time ago 1 of my batchmate wanted to work here but he said no vacancy) or else his wife is getting suspicious cause this man used to really hit on me ,but i never responded to him cuz i just respected him as a staff.............plz tell me wat to do im planin to leave this job bt how?shud i inform him or directly stopped goining there..cuz this man wud never tell me the truth......i feel like i have been used,me feelin bad for myself how stupid can i be.................................and tel me why was he so good all the whilePlz give me a valuable advice rather than bad comments?
I don't see the problem. Why would he need to make a personnel effort to give you your salary? Sounds like normal every day business to me. He clearly is not interested in you in a personnel way so just carry on as any one would with their work colleague.