Yes even if you guys arent dateing she will feel appreciated like missed and all she will like it!! :)
No no no no not at alll guys like girl on girl because they think its hott and sexy and everything but girls seeing 2 guys would just walk away or somthing
Just tell him if he loves you and all your past shuldent matter what you did and it shouldent scare him he prod wants to tell you too about his past! :) if you don't tell him the outcome can be even worse