Emotional Problems with boyfriend.????!?

Like i have been dating this boy for 4 months. he used to be a guy that dated alot of girls at one time and like i think i having trust issues with him. when we first dating he told me he has a son and the child and his mom lived in florida and i accepted it. females were coming at me telling me they didnt think i needed to be with him and we both ignored it. i am a virgin and i am not ready to start having sex yet and he said he accepts that. on saturday i met his family. everyone likes me. i am just skeptical. i dont trust him. females text him all the time and talk to him and i get jealous istantly and i dont know what to do. he says i can trust him but i just dont know. i have cried all day yesterday and today i am in school not speaking to anyone and just listening to music playing games. i am about to be 17 on saturday and he is 20. my mom excepts him and my dad too. our families seem to be happy that we are together. i am little insecure and i think that is what is causing the trust issues to pop up. i want us to be happy but it is so hard to do this. i dont know if he is lying to me about wanting to be with me and how he is a changed person. i am on his facebook default and on his voicemail so all the females know about me and that we are together but i am just skeptical. this is stressing me out. can someone tell me what i should do in this situation. and his personality is sometimes hard to deal with also. he is a very outspoken person. he tells you things how they are and sometimes it can hurt. he says me not trusting him is hurting him but i really dont know. advice please?? serious answers please.