What should you do if you've been seeing a lady for 3 weeks but 8 months ago you split up with your ex who you still love and she's contacted you to say she still loves you?

That is up to you, if you want your ex more than the new girl then let her down nicely and go with your ex, but if you are done with your ex and want to continue your relationship with the new girl then kindly tell your ex that you have moved on and are now with someone else. Good Luck. Follow your Heart.