Should I end this relationship?

My boyfriend Said he just HAD to go out friday night with a old buddy from school days who is married so feeling a little put off because He broke our time together to go out with Mike I did not say anything because It was my understanding that it would be Him and mike or maybe mikes wife would hang out also(I have not met these friends yet but we had plans to because we had a agreement that as a couple we would make friends together and if we found a friend that could not be friends with us both especially opposite that the friendship would not be encouraged(we both agreed on this because past relationships were undermined by those kinds of friends and mikes unmarried sister tagged along the last time he went out with mike) so he goes out with mike and low and behold Mikes sister tags along again knowing my boyfriend has a relationship with me.I got very upset and asked my boyfriend How would she feel if I had not met her and decided it was ok to hang out with her boyfriend.?I told my boyfriend because of her actions and his decision to stay there after our agreement that I find it hard to trust him and a woman that would hang out with someone Else's boyfriend