deception by a female staff

Aoa, Gentlemen, I am 45 years old educated male physically challenged (crippled due to polio), self-made successfully running my own travel agency. I need your expert opinion on my case which is a deception by a female staff who belongs to a poor family background. This 23 years old girl was hired in 2012 as an office coordinator trainee, in just a few days she started adoring me which was noticed by me & I respected her feelings for me. She literally proposed me for marriage after 02 weeks & it was shocking to me. She kept flirting & expressing that she loves me & willing to marry me. I told her that I was married years ago & 03 years after the marriage I divorced that lady due to many reasons & I have two daughters. She said no issue she still loves me & willing to be my wife. She was at 3rd number among 05 sisters & her eldest 02 sisters were still single & due to that reason, she forbade me to send the proposal to her family. She said let the first 02 sisters get engaged & upon her turn, I can send a proposal. I said your parents may not accept me because of many reasons that I’m older than you, I’m physically crippled, & I have 02 daughters then she aggressively replied that she will fight for me & she will make it possible as long as I keep her happy. Then she got close & certainly I started taking care of her like my future wife. She started taking advantages & I kept giving open heartedly. She asked my help that she is willing to do MBA but she can’t get admission & then I met the vice chancellor of the university & got her admission & she started MBA in evening class. I started giving her fee & pocket money other than the monthly salary which according to her for her family support. I was happy & excited & she was deeply involved in me & so do I. I met her family a year later when I returned from abroad & I bought many gifts for her & her family. I then invited her family to a dinner & then I became close to her family too. In 2015 she planned a trip to Nathia Gali with me & her mother & a sister, we went to Nathia Gali & Ayubia & her mother said that I must buy some property for her as a security, even just a 03 marla plot anywhere around the city. I said ok I will do that & I then bought a 10 marla house in Islamabad for her in 2016. Days kept passing & I kept following her commands & laid down all the other staff upon her command & After 04 years of relationship I noticed her lacking interest in me & lack of communication from her side was noticed. I then checked her call records & found that she was communicating with someone else till late nights. She never knew that I may check her call records because her sim was given by me & it was in my name. When I asked her she denied & then I spied on her activities & found her dating a guy & I caught her on the act from the flat of that male. It was an uncontrollable situation for me but I controlled myself & went back to the office where she followed me & she begged my apologies & sought forgiveness & I forgave her on a condition that she won’t ever do such thing again. It was the final semester of her MBA & the final exam was started. She stopped coming to office due to the renovation work was going on in my office, I kept an eye on her call records & found another number of a male in her frequent contacts. I kept saying to stop what she is doing & focus on studies, but she never stopped her communication to that male. After her exam, she texted me that she can’t marry me & her family has decided to marry her with her relative in Sargodha & then she went to Sargodha & she blocked my number. This was not acceptable for me & I searched the guy that she said she will marry him & I texted that guy not to marry her as she is committed to me. After 02 months when she returned from Sargodha she texted me why did I ruin her Rishta with her relative by telling him our stories? I then said why did you deceive me? Then she changed her number & when I approached her father & family they dealt with me like a stranger & said to go away & not to contact them again. Now since then, I am in great emotional condition & unable to manage my life. I suffered a lot since this deception. She owes me more than 9 lac rupees & almost 05 years of emotional relationship which has caused severe damages to my health & business.
Kindly advise how can I deal with them legally?