Save me from myself!

Help! I’ve been feeling extremely lonely. A kind of low I didn’t realize existed, and it’s been crushing me for months now. I was emotionally manipulated and hurt by an ex, when I decided I was done with him a wall went up and I never thought it could budge. But in my pain I remember his promise to always be there for me. I know this promise was more than likely not real. And yes I currently am dating, but still. For some reason I can’t shake the need to hear his voice even if it’s just his voicemail. Should I give in? What could it hurt? No really? What are the consequences?