All relationships at the beginning are exciting and the couple can't get enough of each other, but time can take it's toll. Every relationship goes through a stale period or two and it doesn't matter who you choose to be with. Then children come along and it feels to some young women that life simply ends because they are usually at home cooking, cleaning and looking after a child or two. Your mate is working and getting out in the world while you are probably staying at home feeling like you are missing something or working, raising your child and catching up on chores.
It's time for you both to mature. COMMUNICATION is the key in EVERY relationship and without it you have nothing! Sit down with your boyfriend and express how you feel. See if you can't trade off with a girlfriend to take your little boy once or twice a month on a Saturday night and you and your boyfriend can go out and have some fun and by doing this you aren't paying for a babysitter (you can look after her child(ren) on alternative weekends. No one ever said a relationship was easy and you have to start communicating more with each other and making decisions on having a little more fun in your relationship. Perhaps you could even go away for a couple of days on a weekend.
If you leave your boyfriend you'll just be trading off one set of problems for another. It's time to grow up!