Hello Bobbikay,
My first little girl came from a split condom! oops! I would get it checked to be on the safe side. if you dont want to go into a shop to get a test go onto www.hibaby.co.uk and they sell them quite cheap. delivered to your door and in a plain brown package with no stickers or anything on them!
i would happen to agree with the others, you dont know if your bf was actually in the room with him. This so called mate could be messing around causing trouble or basically being a idiot. He might fancy you, be jealous you are with his friend and he has got to spend more time on his own! there is a 100 & 1 reasons why he might have done it. Personally keep the messages and confront them and see what is going on. If it is true, speak to your Bf and tell him exactly how he made you feel and explain how upset you were. If he has a couldnt care less attitude then he isnt worth bothering with, you deserve better than to be treated like that and be made to feel that low.
Hope you get it sorted bobbikay! be thinking of you. Melons.