is sex hurting me?

Hi. My name is Lex. And I'm 16. My past is.... Shaky. Molested and abused by my step father from the time I was 8 years old up until Easter of this year. It has caused me anxiety issues and stress and I have to see a therapist. I know thats normal. People tell me its normal. Therapist say I have PTSD.  Yeah ok. I got it. I guess I should get on with it though. I started having sex with my boyfriend about a month ago. I felt like it was time. He didn't force me, it was more me asking for it. He was extremely nice about it. Pulled out when I told him to. Kissed me when I looked like I was freaking out. Held me when I pulled him closer. Asked me questions. Asked what was okay. He was completely nice and understanding about it. 

ever since then I've been having more issues. Anxiety issues. I get more emotional. I think Im just trying to deal. New things. New feelings. New things to relate to step father so new things to get past. Sex doesnt bother me. And I'm completely good with it. I want it and my boyfriend doesnt force me into anything. 

my mom told my therapist and they both say no more sex because its too much. They told my boyfriend and now he acts like I'm completely fragile. He doesnt tease me anymore. When he goes to cuddle with me, he asks, 'can I put my hand on your stomach' or ' where would be the best place to touch you so I wont cause anything' I feel so bad. I don't know what to do. Is sex really bothering me? Should I keep doing it?