Communication issues

Hello ima 27 yeah old male that's kinda going through a rough patch at the moment .. I met this girl back in November, she kinda friend zoned me at first but then she gave me a shot , well a little about us we both have pasts and such but she was and has been up front and honest about hers and things going on in her life ... I have yet to communicate to her the way I need to sadly and it's putting a strain on our relationship.. I just wanna chance to show her I can be the man she saw in the beginning.. I've been through alot and sometimes I react to things in a ridiculous manner ... I say things that I won't mean out of anger .. , not to mention I do have trust issues .. and some of her past does scare me but I know she's trying to be a better person or else she wouldn't of told me all about her past what she did where and why ... I just haven't done my fair Share of communication or anything of that matter .. I'd like to know if anyone has some advice ? I really don't wanna loose this girl she is absolutely amazing .. I know I *** up by not telling her from the get go that my ex was trying to get back with me even tho I did respond in a manner she wouldn't txt me again, still I didn't tell the person I'm with about it and she found it in my deleted messages .. I get it the simple fact of telling her would of been nice in her eyes you know ... I just wanna know if anyone has any advice on how to start working towards communication like even just for the smallest of things ... thanks for listening 🎶