Feeling washed up

I recently turned 18 and was with someone for almost a year who was a lot older and I was definitely consensual with everything but he left me not even 8 days after I turned 18 (and he had just turned 32 as his birthday was a day after mine) it was a huge deal and he was threatening to call a mental hospital on me (I have PTSD and had a rough day about 2 days prior but I had told him my emotions in confidence not expecting this) he basically kicked me out and left me by calling the police on me and I just can’t help but wonder if it’s because I expired all of a sudden 😞 it’s almost like as soon as he could LEGALLY try and ruin my life he went for it... mind you 3 days prior we were talking about marriage and he was saying he wanted to elope while I said I want to just wait to have the dress I want because aside from having and helping kids I’ve always dreamed of my dress. Was he just using me?