I feel like I can't love anyone anymore? Why?

Recently i feel like my feelings have shut down and i don't know why. i used to think i could find love now i feel like there's no hope . i was in a very abusive relationship for 6 years that i recently left and i started seeing someone new but he already messed up and he tells me he loves me but i don't understand how you can love someone withing 2 weeks or a month being with them i broke up with him and now i feel like my emotions are everywhere i feel like i don't really care and then there's like a little spark of sadness that i get but is often replaced with i don't care i feel like i cant love again. im talking to other people and i just don't feel as interested what is wrong with me i feel like if i were to start a new relationship that it wont last because ill end up leaving them. is that heartless?

You are in a self-protective stage right now, still getting over a 6 year abusive relationship. It's normal to be scared and wary - it's like grieving something you once loved that died, it takes time to get over it. Take it easy on yourself - you don't need to rush into another relationship. Your feelings will come back when you learn to trust again. Use this time to explore why the old relationship went wrong and how you can tell if someone is going to be abusive. You may have a pattern of behaviour of choosing the wrong person.