a lil rant and need of advice......okay so my boyfriend and I wasn't exclusive when I conceive my…

a lil rant and need of advice......okay so my boyfriend and I wasn't exclusive when I conceive my son, and like a real woman I told him about the , guy that may be a slight possibility because we had sex once and we used protection but he said it broke...but I know my boyfriend and I was having unprotected sex since we rekindled our relations....I don't have a doubt its my boyfriend's baby he feel the same way...he claim's he know when he got me pregnant too...however, it has not came between us...he says he want my son to have his last name...I said we can give him both so when we have paternity test we can then drop someone's name he doesn't want that.. regardless of outcome we're going to be together, because it will be his son regardless because we will be together.

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------->>>my problem is with his ex girlfriend/ mother of his youngest son... they were together 18+ years... I met him in between one of their breakups, but eventually he went back to her besides I was only 20 at the time.... and still doing me...he just left one day and didn't see him for years.. now we're together, but I'm in my feelings right now because she told him that if my son is not his child he's gonna come back home to her... he states that he is not going back to her...he haven't been with her in two years..she think they going through a breakup session and gonna come back...I believe him, I love him...but it's makes insecure that she feels like that, and I'm not going to compete with her...I have nothing on 18, years... she tries to get back with him every time she sees him...he shuts her down, but it makes me feel uneasy... and he has to see her because they have a child together which I adore and love like my own...and I would never disrespect her in front of him, but she doing to much...too desperate and it's making me so mad, because she knows were together and have a baby on the way but she does not care..I've expressed this too him, and he keeps reassuring me he's not going back to her and we are a family now.. we're planning on moving in together and talks of marriage...I wanna inbox get and cuss her out, but I don't because of my boyfriend and his son...I don't know what to do anymore...I get so mad when he go to see his son and I know he has to see her.... and she has a boyfriend and still coming after mines....