it is good for you to think for your boyfriend, which shows that you love him very much.
拖手or kissing is okay, but the relationship between you two will be much more precious if you do not have婚前性行為 with THIS BOYFRIEND.
however, i think your boyfriend will not mind too much, if he knows that you love him very much(i believe you love him, right?)
i do not have much experiences on this aspect, and i'm so sorry that i do not know how to type Chinese.
God Bless you two! i'm sure God loves you very much.
i will pray for you.