Scared to move on

I’ve known a guy for over a year and we dated twice. The second time we dated, everything went so well. He became more mature and was so serious about the relationship we had. We lasted longer than the first time. So the last few days we were together, something was off. He didn’t respond to my messages as quick as he tend to and not that bothers me but it took him hours and hours of not responding and of course I was concerned because I’ve been down this pattern before. I kept asking him if he was ok and he said he was. I kept having this feelings he was going to break up with me and he did the next day. Decided to block me on every social media. I was not so surprised when he did because he told me he needed to get up on his feet and I understood. He was upset that he didn’t get hired to the job he wanted. We were still friends on trivia crack and I could see if he change his pictures on Facebook and he did and it was him kissing a girl. I got so mad and depressed. I messaged his dad if I could get my stuff because I asked my ex to return my stuff and he didn’t for two weeks. His dad told me he hadn’t been home for two weeks and he had to kick him out since he wasn’t following his rules. When I went to pick up my stuff, I had a conversation with him and his own father told me that he doesn’t deserve me. He and his wife was sad to see me leave. They’re ones of the amazing people I’ve met and just sad that my ex don’t really get how much they care about him. So it’s been over a month and I’m missing him crazy. I’m kinda scared for him. Like there’s some ways I wish I could help him. So I’m ready to move on. I’ve been seeing this guy and he’s great. We went on our first date few days ago and we kissed and it was perfect but I still have feelings for my ex. When I kissed this guy, I didn’t feel any sparks or rush. I’m not sure if it’s supposed to be normal. I don’t know if we are a thing yet. Just to be clear, I’ve been with one guy my entire life. What can I do to have courage to move on?