First of all, whether the opposite sex is a good friend, an ordinary friend or colleague, or a fitness instructor, the corresponding reasons and solutions are definitely different.

For example, if you are a fitness instructor, you can only say that your boyfriend is too masculine and straight; Maybe this opposite sex is an ordinary friend, so why do you want to exercise with this opposite sex first? Is it to get better fitness guidance or what is the reason? Or this opposite sex is your good friend and wants to meet and exercise together. It must be someone you trust. You might as well ask your boyfriend to exercise together once or twice, or you can meet together several times at ordinary times to let him know how you get along together and let him trust you as a good friend. Finally, if your boyfriend is forbidden to be with the opposite sex for any reason, it is that he is too possessive and doesn't want you to have any physical contact with the opposite sex-whether it is reasonable or not. This is a personality reason and cannot be corrected in a short time. Unless you have an urgent reason to exercise together, you might as well leave first (see the treatment method of a good friend) and slowly adjust his mentality so that he can trust you. The most important thing is to show your attitude and not retreat to the end. This will get him used to it and eventually become the master of your life.