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Dear Abby: Difficult Conversation With Girlfriend Looms for Man Attracted to Another
DEAR ABBY: I have a tough problem. I care very much for my girlfriend. She keeps me in check and does everything for me. However, my best friend's sister and I are extremely close. By close, I mean we have conversations about how things would be if we were dating. We have so much fun together. We never, ever argue, whereas my girlfriend and I are constantly fighting. I legitimately want the other girl, but I don't know what I should do. -- SCARED AND STUCK IN ST. PAUL
DEAR SCARED AND STUCK: You are a free man, neither married nor engaged. Because you have romantic feelings for someone else, gather your courage and level with your girlfriend. Tell her that while you appreciate everything she has done for you, you want to be free to date other people and think she should, too. The news will probably come as a shock to her, but it's the honest thing to do and better for both of you.
DEAR SCARED AND STUCK: You are a free man, neither married nor engaged. Because you have romantic feelings for someone else, gather your courage and level with your girlfriend. Tell her that while you appreciate everything she has done for you, you want to be free to date other people and think she should, too. The news will probably come as a shock to her, but it's the honest thing to do and better for both of you.

Warning: possible projection ahead
*Except this point: you say you never argue with this girl. Yeah. Possibly this is because you're not dating/making a life together? Look, she may well be the one, but have you heard the expression about the relative color of grass? Just...don't expect constant bliss, okay? You're setting both of you up for failure.
Re: Warning: possible projection ahead
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I mean, if he just felt like screwing up his relationship for funsies, I'd say forget about it, but if this is a case of legitimate want of course he should follow his bliss.
Not.
Polyamory is a thing, but it's not a good thing to start when you and your pre-existing partner are "constantly fighting". I'd start by addressing whatever they're constantly fighting about, and do some thinking about whether (independent of his legitimate pantsfeelings or not) he and his current girlfriend want the same things. Starting by asking what she wants, out of the relationship and in general.
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Also, I think this is a train wreck that everyone but the engineer can see coming for miles. And I suspect that the engineer will only realize it after he's learned from it. Or not.