Trans boyfriend getting breast implants

Hello friends. My trans BF is getting breast implants. He has mentioned the desire to have female breast many times to me, and I said, since this is really important to him, he should go ahead with it. The surgery is scheduled for two weeks from now. He's been in the closet way too long and it's his life, and he should do whatever feels right for him. But, I'm not into women and I'm afraid this will turn me off. He's my boyfriend when he's a man, but dressed as a woman, I consider "her" my friend. Not sexual partner. He wears boobs and bras sometimes which doesn't bother me. But the breast implants are permanent. This is something he's always wanted so I don't want to ask him not to do it. I want to be supportive and be in the body he's most comfortable with…. How do I make my mind understand that it's not the body that matters but the person?!?! I really want to make my brain ok with this change. Has anyone else gone through this that could give me advice? We've been together over 2 yrs, living together for over a year now. He pretty much came out of the "crossdressing closet" with my help and support. I would say at this point he's 80% feminine dress code wise… But I always had the option to be with my "man". This change will take that away.