<human>: Can you condense the text into a few key points?

I [25F] have been with my boyfriend [24M] for 3 years now.  It's been a very stable relationship.  My boyfriend is very supportive and frequently shows affection.  

I met someone [27M] on an online forum a month or so ago, and we have been exchanging emails almost daily.  I look forward to his email, and when I don't hear from him, I feel down.  Our conversations cover a wide range of topics and are sometimes personal, but we haven't crossed any romantic lines.  I told him about my boyfriend early on, and it didn't seem to really matter to him.  

Lately I've been feeling guilty about how emotionally invested I've gotten with this guy, so I talked to my boyfriend about him and how much I enjoy talking to him.  My boyfriend said he was HAPPY to hear that I was talking to someone interesting and SUPPORTED it.  He even liked hearing about some of the things I learned from the other guy.

I'm just confused and am now thinking maybe I'm just making a big deal out of nothing.  But then I just talked to the online guy on the phone for 3 hours today, despite the fact we both had work to do.  I don't think that's normal by any standards.  I feel self-conscious about my emotional vulnerability.  I don't think I have the willpower to sever ties on my own.  Maybe it's fine if both guys are ok with it?  Maybe I should try talking to both guys again?
<bot>: I feel like I'm emotionally cheating.  Talked to both parties about it, and neither of them seems to think it's a big deal.