<human>: Can you succinctly summarize the text in 1-3 sentences?

Not so long ago one of my closest friends (who we will call Johnson) decided to put an end to our bromance. The situation is as follows:

We have a fairly moderate sized group of friends and just this summer one of our mutual friends started bringing her sister (we will call River) around to parties and just to hang out. One night, while Johnson was vacationing elsewhere, I spent the entire night of a party talking with River. We connected fairly well, and to me this is an accomplishment (I'm more of a reclusive, introspective type of person). Anyways, after Johnson got back from vacationing we both hung out with River and her sister one night, just playing board games etc. The next day River and I went out for coffee and spent a couple hours down by a nearby lake. As soon as I dropped her off that night I got a text message Johnson saying "Never speak to me again, you're a fucking weasel." I simply responded with "wha?", to which he replied "Exactly what I fucking said." 

Johnson is what one might call a typical "manwhore". He puts an excruciating amount of effort into getting girls to like him, only to sleep with them once or twice and never talk to them again. Thus I can only conclude that we was attempting to work his magic on River (I should have known better considering hes tried to sleep with/slept with every single girl that we know mutually). 

Furthermore, he has previously tried to get with ex-girlfriends of mine and girls I was already chasing. He even went so far once as to bust in on me and another girl in hopes of turning it into a threesome.

Due to the ridiculous nature of this all, I haven't and won't make any attempt to reconcile. I have changed my phone number and am willing to move on.
<bot>: Closest friend told me to never speak to him again because he found out I was out for coffee with a girl.