Hard decision as Ex declares interest...

Don't go with both...

Some people only feel interest in what they can't have. Make sure your ex isn't one of those people, because then you would give up a goos thing for a non existent thing, and you would lose.

Take a long look at your current relationship, and at the past relationship with the ex. Expect nothing to change with the ex, what was will be - and decide which do you prefer.

But really make your decision. Don't commit half of yourself to your current girl. 

I think that in order to be honest with others, we first have to be honest with ourselves. If you love your current girlfriend, then you should ask yourself why you´re wondering if it could be better with your ex.

Some people are okay with open relationships but in my opinion, all parties involved should know where they stand and if it is all okay with them then it should be ok.

When someone is confused about which partner they should be with, again, in my opinion, they ought to spend time alone and figure out what and who they really want. Being alone makes you connect with your inner self better and thus become a better partner and person. It also avoids hurting your significant other(s).

Your ex sounds like a narcissist who thinks because she had you first,you belong to her and she can put you down and pick you back up whenever she wants to.That's crap,but not as bad as you claiming to love your current girlfriend,then asking if it's ok to just go ahead and date them both.

If that's how you feel about someone else's feelings,it sounds like you and your ex are a match made in heaven.

Sometimes, after some time goes by, we forget the bad things we had in past relationships and remember the good highlights.

Keep in mind that you broke up once before. This means it wasn't all that good....

Unless your ex is a 10 I wouldn't go back unless you just want to nail her a few more times. Stick with the new chick because you don't want take any steps backwards. Try to stay on good terms with the ex so you can bang her if all else fails. She's probably just lonely or in need of attention so don't go thinking she's serious especially if she broke up with you which is what it sounds like. Let your inner player guide you and you can nail them both and more.

Your Ex is trouble with a capital T, run, dont walk to your new Girlfriend.

Why are you still friends with your Ex, shes Ex for a reason.