Again, based on the information that you have provided, you need to make a clearly defined decision. You said that she wants you back to support her...if that is the case, RUN....don't walk, but RUN LIKE HELL!!! She is using you! Unless the common laws of your state mandate that you owe a financial burden to your step-children, you do not!!! The way you speak about their biological father leads me to believe that he is paying his child support...is he??? If so, she is simply trying to complement that with your support. If not, she is merely trying to compensate for "his" lack of support compounded by her own inability to financially provide for her own children. At 15 & 13, about all you can really do is demonstrate what kind of "man" you really are...NEVER personalize their reaction(s) to you...NEVER belittle their mother (or father) in their presence...let them know that you DO care & are interested in their well-being...let them know that you can & will be an unbiased ear to lean on, etc. But do not stay with their mother because that is what she wants...that is in NOBODY's best interest! BTW...how long have you been married to her & the step-father to her children??????

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I wish all the ladies were pies on the shelf...and I was the baker because I'd eat them all myself.
I wish all the ladies were potholes in the road...and I was a dumptruck because I'd fill them with my load.