I'm scared he's gonna cheat on me...

Please dont blast me. I get really emotional ab this topic.. my ex sexually abused me over 6 months ago. I haven't been touched since because I'm terrified. On top of that I'm ab to start my period so that isnt helping the emotional roller coaster. He's been gone for over 6 months in the army so I understand that he's very sexually frustrated. Weve never done anything before because he knows I'm not ready. I'm so scared that he's gonna leave me or cheat on me because he can't wait any longer and honestly I dont blame him bc I cant get the nerve up to try anything again and I cant please him😭😭