numb/heartbroken

I've been dating my boyfriend for 10 months now. His ex girlfriend is practically family because they've known each other for years. She still comes around and In the beginning I was furious, angry, and hurt. Now months later I just feel like I don't care at all anymore. I'm losing feelings because of this. His ex girlfriend is trying so hard for us to break up too so she can get back with him. It's so overwhelming. He tells me it doesn't seem like I care, but what more can I do besides telling him what's hurting me? Besides showing him? I'm barely realizing my worth and I don't deserve to feel like this. There's just so much negative energy and not a lot of happiness. I'll forever be his friend, but we can never be lovers again.