If you have made it seem to the cap that you are okay with only being platonic (when you’re clearly not) then you have been misleading. Be honest with yourself and be honest with him. If it hurts you to see him with other women, then you cannot be “friends” with him. You still feel possessive of him which is understandable, trust me, I get it.. but the problem is you have not been honest with him you’re trying to come across as being the “cool chick” that’s down for whatever, because maybe you think it will win his affections over, but instead it’s biting you in the ass. Your “friendship” is built on a rocky foundation. The only way you’re going to get over this guy is if you allow yourself to. You’re getting in your own way.
It seems like this is a pattern I've seen in myself and the Caps around me. It's more or less severe depending on the placement of Saturn in your chart. With Saturn opposing my ASC and in my 6th house you can guess how that goes for me. 🙃