This boy is 17 and is probably in need of future guidance. My son is this age and is making some very crucial decisions about his future. Life plans and goals.
Believe me I do understand your hesitation, because my DH has the ex-wife from h***!!! Which is his son's mother!! Even though she's been with the guy she left DH for 9yrs, she stills keeps running back whenever she needs/wants something. Guess the new one really can't do anything, not our problem!! She also has 2 daughters from a previous marriage and one of them is the same way with DH. Has made for a very static relationship!
As long as you feel secure (and you really have to be this) that this isn't about her, go with what your tummy tells you!! Your tummy won't lead you wrong. {{{HUGS}}}