Am I getting too close to my (Platonic) guy friend?

ellacha
I have gotten really close to this guy I work with. We both feel really comfortable with each other, and it seems to be Platonic for both of us. The reason I'm asking is because we've started hanging out a lot more, and opening up to each other about our insecurities, etc., including stuff we've "never told anyone else". I feel really lucky to have such an amazing connection with someone else, but I know if he were my boyfriend, and he started sharing stuff with a female friend- even a Platonic female friend- I'd be feeling a bit uneasy. Should I bring this up to him? I don't know his girlfriend personally, and I don't know how she feels about it, but don't want to put any strain on their relationship. Help?
Am I getting too close to my (Platonic) guy friend?
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