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From the moment they met, Bingley's love for Jane was constant and unwavering. Bingley, for all his endearing golden retriever-esque cheer and exuberance, is humble to the point of insecurity. So he's all too ready to believe it when Darcy, the person whose opinion and judgment he values most in this world, informs Bingley that Jane doesn't seem genuinely interested in him. Bingley never once doubts how deeply he cares for Jane - he just lets himself believe that Jane doesn't love him in return.
I saw something (not here - it was on an inferior website lol!) about how Bingley is the type to stray and just mindlessly fall for every pretty girl who crosses his path, but there's actually less than zero evidence of that. He loves Jane and ONLY Jane - but since he and Jane don't possess enough of the novel's titular 'pride' while Darcy and Elizabeth initially have too much of it, Bingley just didn't allow himself to believe that someone as lovely and sweet as Jane reciprocated those feelings. Even during those months apart, rather than latching onto another infatuation, Bingley continued to pine over Jane and his feelings remained strong and true. I'm the unofficial captain of the Charles Bingley Defense Squad in case anyone else wants to join ;)
@missielynne , I had to tag my fellow Jane/Bingley lover!