I met someone new..

My ex & I were still seeing each other after our break up. Things began breaking off little by little because he was getting himself into trouble. I met a guy at our school's band camp on Friday. Then today my ex came to me & told me we had to stop seeing each other because he's leaving to Mx since his dad is in bad health and could be dying. He began to tear up & said he needed me. He still has some things to do so he won't be leaving any time soon & im torn on what to do. I don't want to leave him at his worst time because when we were together, he never left me. & even broken up he always gave me a shoulder to cry on. I just don't feel the same way as I used to..

I haven't flirted with the guy I met. We simply exchanged hellos since he'll be behind me while marching. I haven't gave me any hint that I may like him.

But on the situation over all, should I follow my heart or listen to my mind & help out someone in a rough patch... any advice would be helpful