Encouragement to move on

Ladies I need help! I dated this guy for 2-3 months. It was a roller coaster! It was fine in the beginning, he’d call/text me everyday. But we would fight a lot on the littlest things and that I’m not “aggressive” enough or not opening up to him. I didn’t even want him posting us! Towards the end we distance and it was hard to talk to one another. The background is a lot but I’m 20 and he’s 27. He has a lot of problems to having a kid at a young age, constantly moving place to place and I’m sure he has PTSD (veteran). I just notice he acts to be more concern about relationships than seeing his own son. After the split, he was dating other girls but would still call me and stuff (drunk) I finally blocked him on everything! Number, social media. Plus he’s psycho. The other day I saw this video he posted of him smoking at work saying that smoking cigarettes save lives. Because it helps calm him down and if not he would be shooting up everyone or up the place something like that!! It scared me. I’m not afraid to be alone (like he is) but all this was a discouraging experience to date and meet new guys. I just need words of encouragement to move on.