My best friend told me hes in love with me.😳

Sorry, this might be long

A little backstory... I met my best friend 4 yrs ago. I went in for a job interview and got the position, he was my coworker. We hit it off and got really close. Since then we've been side by side. Worked two different jobs together and even at one point were roommates with our spouses for 6 months. During this entire time we were both in committed relationships, me, being married, and him, engaged.

My marriage ended right as covid started. But I reconnected with my high school sweetheart last October and I couldn't be happier. I'm actually moving this October to be with him and to start our lives together finally. (navy man, he got stationed elsewhere recently)

However, this past month and half, my best friend has been crashing on my couch because his fiance left him after being together for 8yrs. He decided to move back to his hometown in another state as to be close with family.

We've been through alot together and we've supported each other. Ive been taking his move a little hard because im so used to him always being there, but I was going to be moving myself anyways, just the good bye became sooner then expected.

On his last night here. We were watching my favorite show and playing some video games. We started having a heart to heart conversation, when out of no where, he tells me the exact thing I was wearing on the day we met. I was surprised since he doesn't usually have a good memory. But I continued to listen. He continues saying he's been in love with me since the day we met, and how he wished he would've had more time with me. And how he would have made a move on me or told me sooner how he felt, but that he would've kicked himself in the butt if he left before telling me. He said he didn't expect me to say anything back but I just had a feeling that he was hoping I would ask him to stay.

I don't know what to do, I am unable to reciprocate that love because I don't feel that way for him. I am in a very happy relationship and I'm grateful for the man I'm with. But now I feel like in loosing my best friend. Since then I've been reading too much into my best friends text messages because I now know how he feels. It's been awkward. I just want my best friend back. But I don't see that happening with the situation now.

I just needed to get this off my chest. I promised him I wouldn't talk about it...