Allow user to send one request at a time.

I have paid friends addon install on my site when user login and on member’s directory page all other users profile are showing where I want to allow the login user (USER 1) send one friend request to other profile (USER 2) at a time. When user two received a friends request then for login user disable the other send request button for user one until the user two accept that request within 48 hours.

If the user two reject the friend’s request before 48 hours then enable Friends request button for login user (user one).