So since you’ve been having unprotected sex for four years, I think there is little point in starting to use condoms now until you get further test results back.
I think it will likely be negative because 1) your partner is negative and 2) the antibody test has had plenty of time to pick up infection from the other partner in April and 3) your antibody test is NOT positive . Another IgG test will likely be in this same range. Only the western blot can be useful as a clarifying test in this kind of situation.
Glad I could be of help. If you have other questions, please feel free to renew.