<human>: Condense the text into a few key points

We dated for 2 years and things went rather well. However at the time I was struggling with insecurities led on by my weight and plans for the future. As a result I felt like I couldn't trust her and so things went downhill. 

We broke up 3 months ago and to be honest when she broke up with me I felt great! I felt like if she didn't love me for me then there wasn't anything I could do about it and that brought me a great comfort. 

We still kept in touch and spoke rather often.  We decided to hang out a few days ago and I ended up spending the weekend with her on a skii trip.  I found out she was dating someone else and I was crushed. Throughout the weekend we had an amazing time and it felt like I met her for the first time all over again! Also my self confidence is sky high right now so she said she felt the same way. 

She said she thought I moved on and so she's started dating to move on herself. Here's the tricky part.  How do I know if I'm in love or if my jealousy just got the best of me and so I tried to seduce her again? I feel like I'm back in love but I know I'm in the moment so my question is, how do I know if I'm in love? 

Yes we slept together last weekend multiple times and I don't regret it because I felt we had something special that her current bf didn't and couldn't offer (she also claimed she only dates him because it was "simple") 

I'm fairly certain she is breaking up with her bf within the next week as a result of everything not sure if this makes a difference or not.
<bot>: spent amazing weekend with ex, feel sparks have rekindled.  Not sure if I'm in love or if fueled by jealousy that she had a boyfriend.