aborder

Long story short/medium; broke up with my gf of about 1 year end of October last year. However, we have kept seeing each other on/off since, say half the time. However, the "seeing" isn't anything like the relationship was before; the seriousness gone and more independence is back (And all the problems we had are gone!). It's just good company, conversation, support and yes, it's still physical.

Although just recently she's had moments where she's cried because she wants to see me more, is worried about the path we're currently on leading to her wanting to get back together (We really do enjoy each other's company, and have been happy together since its no longer serious until this). Rather than end up hurting her, I decided to end it. But met someone new in the process.

My actual question is this; I like to be open and honest. Clearly, it seems continuing to see my ex, is leaving her with moments where she's already getting hurt wanting more or atleast thinking about it, and there's no chance we're going to get serious again. That's more than enough reason there to end it! Now should I also be open and honest to the point where I mention I've met someone new and want to see where it goes, or leave it off? The problem is I really don't want to hurt her. I'm sure she'll be in tears with just the first bit, and because we've kept seeing each other, we both do still have feelings for each other, I can easily admit that, that we're still close and I'm a shoulder for her. I don't want to hurt her in the process, so is the easy way the right way to go about it, or the full details?