ok so i apologize if this is the wrong section but i need help.

ok so yesterday my LTR of 1.5yrs left me for her baby daddy. i met this girl last summer volunteering at the time she had just been dumped by her bf who accused her of cheating on him and getting pregnant. Me being a good christian i helped her out when her parents kicked her out and none of her family wanted to help her. we started dating and i got her on her feet i helped her with everything relating the the baby and her well being. i got her a job where i work making 50k a year i got her a car and i helped her save so she could get her own place i got her back on her feet. Im deeply in love with her and i thought that she was also in love with me until about 3 weeks ago when her baby daddy came back in the picture and wanted to see the boy. I grew up without a father so i couldn't deny or get mad if his father wanted to be back in the picture so i let it slide. I know there are a bunch of red flags everywhere but i ignored them due to my pastors advice. Yesterday she calls me out of the blue and tells me her and her exbf are going to give it another shot for the sake of the baby and that i can come pick up my stuff after church or else her exbf would throw them away. im heartbroken and angry idk how i could be so naive to think that i had found my unicorn. I feel betrayed by my pastor, my ex and my own family telling me that she was all part of "god's" plan for my life. I gave her everything and helped her during the worst time of her life and she spits on my face for a guy who doesn't even have a car, a cellphone or a fucking bank account.

My question for you gentleman is how do i deal with this when we both work in the same building and go to the same church so i have to see her everyday so should i ignore her and pretend she doesn't work there or do i just hold frame and act like the last 1.5yrs didn't happen?

before anyone says anything im in the process of reading the sidebar and i also got TRP pdf on my tablet to read i just renewed my gym membership and threw away everything that reminded me of her i know its kind of childish but we all deal with heartbreak differently. She still owes me about Im just pissed off at how i could be so naive to believe that AWALT didn't apply to a church girl.