Wow ! Where do we start...............as i see there are 3 possiblities
1) you are creating a situation from your own insecurities...........
2) he loves you and is sticking by you because he loves you
3) he doesnt love you
you of course are i think convinced its 3), i am convinced its 2) with a bit of 1) in it.......................
but only you can really know.....................
as you get older, the men you meet have all loved other women - either they lost them thru divorce or death and you just have to accept that - arent we all capable of loving more than one person - we love all our children after all..............
he did love his previous girlfriend, why shouldnt he have, he didnt know you then..........................but hes not with her, hes with you and your child which youve had together.
perhaps, his reticense is his worry that you wil keep going on and on about it "do you love me more than her "
does it matter ??
enjoy the love you have together, enjoy your child and stop being jealous OR leave him and find the person who will only have loved you and no one else ( believe t me hat becomes harder the older you get !!!)
good luck xx