Please help me with my housemates! Dont know whether to say something.

Okay, I have 2 housemates- Sarah and Charlie. Sarah- always told Charlie hat do but in a manipulative way i.e. ''Im not going to invite so and so out with us/I dont think we should talk to her'' and stuff like that. Charlie- very easily influenced, does exactly what Sarah tells her or ''suggests'' I was very good friends with them both for about 6 months. Sarah was always mutual in effort made to be friends, but with Charlie it was always me making the effort. I got on well with Charlie, but in holidays it would always be me texting/making the effort to keep in touch, arrange things to do like nights out etc. Anyway, after exams, I started trying to arrange things to do and theyd make up excuses, so I just gave up in the end. Now basically, I went on holiday for 2 weeks and since getting back its recently got really awkward.We will be in the same room and we all say hi but then they dont talk to me, they just talk to each other and ignore me. Sarah and Charlie have been doing things without me since I got back, such as going on a night out, going for meals and the cinema. They make no effort to keep it from me, they just advertise it on facebook where theyve been. The thing is, I can understand why Sarah is being funny with me, its cos she clearly thinks Im being funny with her (only because i was fed up making an effort only to keep getting excuses). But Charlie, I have only ever made an effort with! And im more annoyed because shes being a sheep and just following Sarah. Ive hung around with them both enough to know that its Sarah manipulating and ''suggesting'' things. Why cant people ever think for themselves? Charlie talks to me when we're in the same room, and neither of them are unpleasant, but its like theyve defriended themselves for no reason. And now even if we make up, its obvious Charlie will drop me at the drop of a hat everytime Sarah does.... Im just really angry. Mostly at Charlie for being a sheep. Should I say something? Im so tempted to send angry facebook messages to them.

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