It may be or it may not be illegal but is it worth it, if it is illegal. Sometimes, your boyfriend may not be acting "normal" but it might be easier to ask your boyfriend what he has been doing. You may be happily surprised to find out that he has been doing something romantic for you or you may be saddened by asking the question that set off a relationship ending fight. However, the best thing in any relationship is the trust between the two involved.