Should I give up on him? All I have are negative thoughts, someone talk some sense into me?

He is a DoD contractor and just got back from being overseas on Wednesday. He was gone almost 2 months but then got promoted and they brought him back to start his new job. Well Wednesday I was working all day. I didnt get home until about 11 at night and had to be to work 930 the next day. So I didnt see him beacuse there was no way I would have been able to get up for work. But I got off early Thursday and Friday and then would be off Sat,Sun, & Monday. I told him that I was sorry I couldnt see him that night (and said said that was ok) but I def wanted to see him the next day after work. He said that sounded great and that he got off at about 330 or 4 and worked the next 3 days. So Thursday I was so excited to get off and see him and when I finally got home at 6 I text him and told him to let me know when he was free. He didnt text or call me at all. So on Friday, maybe at about 7 I text him and told him that I wanted him to come over Sunday or Monday and spend the day with me. He text back immediately and said ok and that he just got his car back a few hours ago and is free sunday. Saturday night I text and asked what time I should expect him tomorrow...he didnt reply...sunday morning at about 1130 I called and no answer, then I text at 3 asking him if he was busy and to let me know when he was coming, if he was at all. He didnt respond to that nor have I heard from him ( I havent bothered contacting him anymore) im pretty pissed that he bailed both times and didnt even tell me, but idk if im overreacting or not. Im gonna give him til wed before I call him to tell him im done. When we first got together we told each other that we are tired of the games and wanted something real (he is divorced and has been cheated on by nearly every gf he has had) He asked me what my biggest fear in a relationship was and I told him being cheated on and he said that no worries there because he doesnt cheat. On our first date we were talking about our past relationships and exs and I told him about my most recent ex ( we broke up because he started acting shady and barely responding to anything I said, then one day he just completely started ignoring me and I kept texting/calling him until he responded. My reasoning for that was simple: if your done, then tell me. dont just ignore me. Turns out there was an emergency out to sea(navy) but he never told me, but yet continued to get on facebook everyday. So he wrote me off as crazy because he is inconsiderate) my boyfriend thought that was completely childish of him and told me that that wasnt my fault and told me right then that if there is ever a time that he doesn't respond then its because the ships he works on rarely has service. Also before he left to go overseas I told him to promise me that if he ever wanted to end things to let me know and dont ignore me, and he promised. So this leads me to stay positive and think that maybe something happened. Im trying not to make the same mistake I made with my ex, but honestly iv been hurt so much by men and lied to that its hard for me to stay calm and rational. What should I do? He is 24 im 19. I really like him and want to be with him, but Im scared of being hurt. Can someone talk some sense into me