Hi! I'll be glad to be of help with this issue.
I can imagine how frustrating this situation must be for you. You are clearly a loving and caring girlfriend and you are feeling rejected by your boyfriend. And he has given you reason in the past to feel as though he may not be so interested in you. Last year he wandered and now he's seeking pleasure on his own.
And this is actually the key to my answer to you that you need to consider and think about. It is normal for people to masturbate occasionally even when they have a partner. But if it is frequent and takes the place of lovemaking with their partner, then no, it is not normal. It is a sign of a problem.
For men, sometimes it is easier to feel sexually more relaxed when it is not in a very close relationship. The intricacies of a close relationship with a woman can feel hard and require a lot of effort. And so some men feel freer and more relaxed to imagine a carefree, no requirements-made-of-me fantasy than to actually have to interact sexually with their partner.
Okay, I wish you the very best!
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