Dating

Best friend’s boyfriend confessed to me. I do like him but don’t want to ruin friendships. What should I do?

I’ve know my best friend (bsf) for almost 12 years and we’ve been inseparable. We call each other platonic wives.

She started dating B last year and he moved in her house 4 months dating. I was a bit worried for her but they seemed okay.
a couple months after bsf texted me that B was lonely after moving and all his friends and family being 3+ hours away, and bsf works overnights. So she asked if I could hangout with him and we became good friends.
Problem began when B started telling only me about his emotions which was fine to start, but it got to the point both myself and bsf said he shouldn’t turn to me he needs to talk to bsf. That went on for a couple weeks and started to get a weird vibe that he liked me more than a friend but brushed it off as overthinking and cut back on hanging out with him a bit.

last weekend B helped me move near his hometown in the country (bsf helped too just couldn’t do the big drives cause of work) B said it’s made him think about how he doesn’t like being in the city and it’s caused fights with bsf, which I know about she’s told me.
B ended up spending the night with me and my fam cause it was super late. Nothing happened we just talked and he slept in his car but I got that vibe again.
A few times he’s also said he wants to get something off his chest but backed out. Today B said the same and I said if it’s really bothering him just get it out.
he asked if I believe in right person wrong time? And I thought he was talking about bsf, I was wrong he meant me.

Said he feels more himself and feels we’ve more similarity. He knows he’s a pos for thinking it and telling me but doesn’t know what to do. I told him need some time to think.
I do like him as a friend but I’d be lying if I said I haven’t thought about him in the same way before.
I feel like I can cut out that thought before it takes form if that makes sense but after he said that I don't know what to think. I know bsf loves him and I truly want the best for her but im lost

Best friend’s boyfriend confessed to me. I do like him but don’t want to ruin friendships. What should I do?
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