Just for a reference point, and speaking as a Not An Addict/Alkie guy, if my partner were to come to me and express the concerns you have . . . I would hope I would say something like, "gee honey, how could I miss that? You are my first place and only love, and I will do what it takes to help you feel that very securely."
And do so.
HOWEVER, a typical All-Drama-All-The-Time-All-About-Me-A might just do the "accusing me of being a "jealous, insecure, insensative, person...." routine that you fear.
I suppose that could be basis of whether he is keeper?