Our expert says:
This would be highly embarrasing to any man, but he seems to have dealt with it gracefully. ( I nearly said "handled it well". but that could be ambiguous ! ) He did nothing wrong. Most women, and an even higher proportion of men, masturbate --- it is normal and healthy to do so. And in the context that, within your relationship, you are temporarily less interested in sex, and he is, naturally, not, he chose the most honest way of daling with this, in no way unfaithful to you, and indeed a way that would help him to remain faithful.
You say you feel a bit cheated --- of what did he cheat you ? Some minor sexual activity you didn't want and wouldn't enjoy ? As for the focus of his fantasy, remember his arousal wasn't about THAT girl in THAT bikini, but about "girls", a much more generic arousal. while you were temporarily unavailable.
It would have been the same had he been visiting a porn site, and very different indeed had be been cheating, in actual sex with another person. Work this through, yourself, and try to find a graceful way to indicate to him that you understand, and are not angry. That will benefit both of you.
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