Has this proven a lot?

I’m dating someone who is in prison , we met before he went in but now I think I have made a mistake ! . He calls me every day sometimes 3 times a day and he runs out of credit because we talk a lot , I wrote in a letter saying I could help towards phone credit but soon after I sent it I regretted it , he told me he got the letter and I was hoping he would say no he doesn’t want me helping towards credit but he said yes and how to but never even said thank you , I regret offered as I now feel desperate which I’m not ! And now I feel my interest in him has disappeared, if he did not agree to it then I would e respected him more , I know it’s my fault but what do I do now? Did I do wrong or am I overthinking? Thank you for any help given
Has this proven a lot?
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