Sarah you need to reasure your man that just because you use your toys doesnt reflect on him at all, I hear this often from my readers on my site and so many are not sure how to introduce toys into the relationship or respond to jealous boyfriends.
I agree with Avrielle its healthy and nothing wrong with it. You are learning all the time about your body..hey Im still learning now. By trying different design toys you get to learn about your orgasms ands what works for you; so its benefitting him in the long run.
Talk to him and reasure him its natural, get him to use it on you.
I have been using sextoys for years ands would never stop using them and I have been with my partner for 25 years. He encourages me to use my toys even buying me special ones.
His quite happy in knowing that I use my toys wether his there to watch or not, it doesnt reflect on our relationship at all. Most the time he joins in and loves to take control using them on me.
You need to encourage your boyfriend to use them to enhance foreplay and general sex with each other, maybe buy him a cockring or masterbator sleeve so you can share these together.
I would be quite happy for my OH to use toys when Im not there, at least his not off finding another girl.
Goodluck hun its all a learning curve for the both of you.