I am not replying, am I doing the right thing?

Pretty much every friend I ever had used me in some way or another. This one girl that had a bf, when he wasn't there I was, back and forth kind of thing. Yesterday for like the 5th time they asked me to get out of my car so they could make out. She then tells me again sorry "best friend" for everything. I shook her hand and left. Her BF my friend took my two girl friends out to dinner with my money, I was feeling bad that I took them and it was 2 guys and 4 girls a misunderstanding I gave him money and said get them something to-go. But no the bastard wasted my 100 bucks and had fun at the table while I waited with his girl and sister in my car. I am emotionally dead because I payed for this guy, his friends, his gf, everything and he manages to do this to me and his gf turns back to him. (even though he cheated on her twice) None of them ever payed me for gas, (went with this guy on a 4 hour trip for nothing) movies, etc etc. His gf is texting me non-stop apologizing and trying to cheer me up. I am not replying that was the last straw. Right plan?