Maybe two or three I feel really close to, and several more that I'm friendly with and am around on a regular basis. Others, I was friendly with and saw on a regular basis once and would hang out with for a bit if I randomly saw them and they were up for it, but wouldn't be likely to hunt down to hang out. There's gradation.
My most recent ex was an extrovert; by comparison I felt like a recluse. I figured out after awhile that there were a few things at play that were masking how many "friends" he had- like counting people he hadn't seen in years as "friends" or "buddies" of his if there hadn't been a specific falling out, or counting friendly acquaintences as friends. He was talking about a mutual friend of ours once and said, offhand, "...who you call your friend even though she's not really your friend..." I'm pretty sure on some level he was trying to be a dick (I think he wanted to drag my self-esteem down to where his was), but I don't think he knew that would actually have me in tears. At the time I hadn't realized that he sort of cheated in the way he counted friends, too.
All that said, he legitimately managed to keep a large social circle by hanging out with groups of people, rather than individual people. He did two pencil-and-paper "game nights" a week, band practice every week, and would spontaneously hang out and drink, get high, or play Magic (or all three) with people he was friendly with. All good strategies for keeping a large social circle. The same strategies peobably also contributed to why he's had long-term problems with school achievement, and with keeping any girlfriend more than a few months, though.
