I'm on the other side of your situation.
Multiple times, I gave my partner permission to leave. I really meant it—I knew what pain I was causing. He never took the opportunities I gave to leave, but long story short, we are now divorcing. We are trying to remain (or become) friends, and that is trying too.
I don't know the specifics of your situation. I can't say for sure if he's trying to please you or if he really wants it—it might be both! But that situation makes sense in my mind. It sounds like he's quite attached to you, but he's also quite aware of the pain in your relationship and how he might be causing some of that. I'll bet he wants to be with you because he loves you deeply, but because of his love he also wants you to be well and he's worried he's hurting you. That would be a confusing situation for
anyone, even without a mental illness.
There are also other reasons a PTSD sufferer would want to be alone, so please try not to take it personally. It's not personal.
I like
@shimmerz's description of conflicting thoughts. The way I experience it, I feel emotions and I think thoughts, and the two usually do not line up. For example, I might feel fear while thinking rationally. If my thoughts mirrored my feelings, I would be unable to function in the world. Many patients with PTSD actually have a functional disconnection between the two hemispheres of the brain. The brain doesn't talk with itself like it's supposed to, and that contributes to these unreconcilable thoughts and feelings. Sometimes it feels like my mind is fighting with itself. Seems like that might apply to the conflicting thoughts your partner is having.
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I don't think there's any "right" thing to do in your situation. You love him, and love is a strong bond. Please take care of yourself first, but maybe this weekends-only arrangement will do some good. Who knows; time will tell.