My boyfriend has a pen pal who sends photos?

Anonymous
long story sorry

started dating a guy about 7 months ago. We have become very close and are hoping to start a life together. The thing is he has a pen pal in Holland he wants to keep in touch with, they email once or twice a month and she sends photos some nude and I saw in an email he told her she looked beautiful as always and said at the end love always. I asked him about it and he said he just got into the habit of saying it. He got her as a pen pal in prison and has been emailing her for 5 years. he has been very honest about it all and says she means nothing romantically or sexually just a friend and doesn't know why she sends photos but it all bothers me he even has a disk of all the photos she has sent and saved all her letters.

He offered to ask her to stop sending photos and said he would stop telling her love you and saying she's beautiful and stuff but doesn't want to stop talking to her completely. He says I shouldn't worry I am the one he loves and wants to spend the rest of his life with .

should I be worried?
My boyfriend has a pen pal who sends photos?
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