Am I right to be trying for a baby? Advice ?

Me and my partner have thought a lot about having a baby, it would be our second. I had my nexplanon removed after debating for months weather we are ready and then I booked the appointment now it's gone. I love him more than words can even explain and we have a 17 month old son. Who is absoultley gorgeous, anyway to the point we have been ttc, and I know Facebook is the root to all evil but I had mine deleted, he never. My friend I can trust with anything told me he has been liking pictures of other ladies, and let's just say us love to have a figure like them!! He's added ladies too, like really pretty stunning girls! When I confronted him, he said if I wanted anyone else would that ring be on your finger? ( I don't know am I just a back up???) he swore to me he's never spoke to them. But is this a sign were not ready for a baby?! I really want this and he says he does too! But who know? Any advice xx