Your boyfriend's cousin's girlfriend, I reckon.
Absent any other twists... your sister's boyfriend is also your cousin, for example, so that your sister's boyfriend's cousin is your brother or something... it is completely fine to date your sister's boyfriend's cousin if you want to.
I'm not sure if this will help but does your boyfriend like your cousin? If you have faith in your boyfriend then even if your cousin really DOES like him, you know that your boyfriend won't cheat on you. If he really does cheat on you then all i can say is - you deserve better than that. As to how to tell ... I guess you can talk to your cousin about it? or you try to talk about your boyfriend to your cousin and notice her reactions and expressions.
They call you their cousin also!
You should move on and not worrying about calling him anything. If he's moved on with his cousin, you should remove yourself from that situation as soon as possible.
No. You are not related to the spouse of a cousin, much less the spouse's cousin.
you call your mums cousin a 2nd cousin, because your mums cousin is her 1st cousin, wich makes your mums cousin your 2nd cousin.
The brother of your wife's cousin is also her cousin. You can call either of them "my wife's cousin." You are not related to them.
I guess you could call her cousin-in-law :)
succa!
That would probably be your cousin-in-law.
Why don't ya call him by your cousin name +jr.