Welcome Stillinlove - There is not much I can say that others haven't. I will tell you it will be a difficult road to travel. If you and your mother were "too" open minded for the Catholics then you sre in for a rude awakening. That is why your boyfreind is small minded. The JW religion controls that portion of their life and their thinking.
Now, you do not mind if your children are witnesses but you want them to experience other cultures, dating and soforth. This may be difficult being in a religion that is very controlling regarding these issues.
This even speaks as far as headship is concerned. As OTWO mentioned, he may be a "strong" JW someday and this will put a bump in the relationship if you are as strongminded as you say you are. Or, if you become a JW and submit to the mind contolled brain washing effects it may not bother you.
You have to think this completely thru yourself. I suggest "Do your research about the religion" before you commit to anything.
Quirky1