Yes, of course it is. Unless they are in an "open relationship" then any other sexual contact not within the relationship is considered cheating. If she doesn't know, then keep it to yourself, they can deal with the problem.
Kevin's boyfriend in Brothers and Sisters is played by Luke Macfarlane.
If they know about each other then no, it's not technically cheating.
Your Sisters Boyfriend Yourself
I think both.
what are you supposeto do if your boyfriend moves far away with his family?
Kiss his sister first
Because she is a preety littlle liar
Yes. Christina Cimorelli has a boyfriend
He cheated on her with her sisters best friends sisters cousins daughter in-law
it depends on what the reason is.
shes gpot a boyfreind tim
If the mother willingly gives it.