Is my boyfriend sincere?

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I am a single mom with a 5-year old boy and have a steady boyfriend for almost three months now. my boyfriend and i met online and became friends for more than two years before we ended up as lovers. i love my boyfriend and he does reassure me every so often about his feelings for me too. what bothers me though is that, we are still at the early stage of our relationship, but he is already expressing his intention of having a family with me. he is 35, single, and just recently resigned from his job because of poor management issues in his workplace. he has no problem getting a new job as he is good at what he does (he is in the I.T. field), but scouting for one now, he prefers a job overseas as our country doesn't have much to offer and he believes if he should raise a family, he would need a really good-paying job which he sees may only be available in other countries. i am so surprised that at this point in our relationship he is already thinking of settling down with me, and his future plans include me and my son. he has met my son only once and they have both come to instantly like each other. i am really not so good in telling if a guy is sincere as i only had one boyfriend in the past (the father of my son), who did fool me into believing he was sincere about me. now here i am again, faced with the same dilemma. can anyone tell me if my boyfriend is sincere? or at least give tips on how to tell when a guy is really sincere?