What does it mean when a guy says, we can only be friends right now?

Anonymous

So, more details… we’ve both know there is an attraction between us, and we’ve been flirting since last year. We’ve been on 3 dates in which one of them we had a little misunderstanding so we stopped talking and then I texted him a few weeks after that and we went out and had sex. He sent me good morning text the day after and then he disappear the whole weekend and Monday he was apologizing for being a bit off for bro writing me, he mentioned there was something going on in his life so I tried to be understandable. I asked him if he wanted to go out, he said he was going to be busy as he was going on a trip for a week in a few days.
I told him I was confused as sometimes I felt like he liked me and sometimes I felt like he was avoiding me, he said that something happened on his life that was unexpected (this was a week after we had sex) so he came from his trip and I asked him if he wanted to hand out and he said that we could only be friends for now as he caught feelings for someone and he wanted to explore that. I feel really upset because before we had sex he told me he was not dating or seeeing anyone and he even mentioned he was not ready a relationship but he was not closed to one.

I feel so confused, how can he caught feeling for someone in just a few days? It feels like he was kind and of using me.

We work together, so not sure how to behave with him. I kind of want to be cold and indifferent with him

What does it mean when a guy says, we can only be friends right now?
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