<human>: Can you provide a brief overview of the text?

Throw away account here.

So I'm in a long distance relationship of 1.5 years. Everything is fine, there are really no problems and we have a lot of fun. The problem is that I feel like the relationship has hit a ceiling and there isn't any more there that will want me to take the next step and end the distance.

On the other hand, the only girl I've really seriously dated prior to this (my ex of about 3 years) has been on my mind recently.  We talked for the first time in 2 years recently for multiple hours and it's like we haven't skipped a beat.  I really missed her; and I felt a connection I haven't felt with any other girl.  However, I'm not sure if it is actually her that causes that or maybe what we had was actually real. What I mean by that is I question wether or not that was exclusive to our relationship or if it can be recreated but just not with the girl I'm dating now.

We broke up for a ton of reasons, mostly because we were immature and didn't know how to handle things. We've been broken up for 2 years now.

My question is, 1) how long is enough time to know if I can see things going further with the girl I'm currently with? My concern is calling it quits too soon and maybe it could grow into something else. 

2) What are the odds that my feelings for my ex is real? I feel like she knows me the best of anyone and we had a real connection. On the other hand I feel like if we get back together we could fall into a previous cycle of being on and off again.
<bot>: Should I continue dating my girlfriend that I am content with right now or should I end it and either start talking to my ex/looking for something different?.