He didnt even tell me that he is leaving the college

I work in a dental clinic of my college staff,earlier things wer fine.he was a very good and an understanding man but now he has left the college and im still working with him.but the problem is that his attitude has changed,he is no longer the same…I was very close to him and shared alll my problems but he never mentioned hhis own problems,I thought we were very close the worst part is that he didnt even tell me that he is leaving the college I got to know it through otherearlier he used to give me patients to work on them,but now one day he says you do it other day he tells me to give it to a specialist…I really feel bad ,I don’t know why is he behaving like this im just a 21yr old girl,he is 34 and married and has a daughter too…students used to say he likes me,infact when he was in college he did a lot for me…now I take care of his clinic he sits at home,I was very loyal and very sincere in my work I never cheated him…infact he pays me so less,still I dont mind because I was interested and treating the patients more…now my job is to take appoinments.dats it…im nt his secretary or sumthing..even im a doctor …earlier he wasnt like dis…I told him my smallest secret to him and he didnt even bother to tell me he is leaving..I was hurt even now im hurt…I loved aand respected him so much…I did so much for him now I dont know wats wrong with him…u tell me shud I continue to work with him or leave or is he just using me …and yyy os he doing like this..he was so supportive gave me d best marks and he himself told me to come and join his clinic…he used to tell me you are very naive..he even flirted..when I was in college he used to tel me cum I wil drop you home and once I met his wife too,in front of her he didnt even speak or looked at me.as if he doesnt know me…pleaseee give sum advoce on how to deal with dis…I wil go mad..im a veryyy emotional person and he knws that den why is he doin dis