Scared🤢

So I've recently gotten with this boy I really like but I'm so scared of commitment. It's not because I can't be loyal, I'm too good at being loyal. I get attached so easily and care too much, I was in a 2 year relationship where my boyfriend would take advantage of my kindness and treat me so bad but I'd always forgive him cause I loved him too much. When we ended, he straight away got with another girl but he'd randomly text me to remind me he still existed. I was heartbroken and felt so shit about myself. So I haven't even considered having a thing with anyone since because I was scared to be hurt again. I don't want to be so scared , I want to give this boy a chance. Any advice how I can loosen up ??😅