Advice??

So me and my boyfriend have been together for awhile. Everything was great in the beginning, we moved in with each other and it was still good but I have bad anxiety and trust issues.. so I always ask him the same thing I don't mean to and I know he gets annoyed with it.. I'm just scared to get cheated on but he swear on his little sister and he tells me to just trust him but my ex bf fucked me up so bad they were controlling. Recently I've been bad with depression and been on his nerves alot he told me if I didn't start changing that he was gonna leave, I understand cause I can be very difficult at times. I know hes stress with work cause hes been none stop working so i want to spend as much time with him as possible. He stayed at his friends last night to have space. He's gonna give me a chance and I'm gonna change cause I really don't want to lose him. He's not like the guys I've been with. I just need advice..