What would you refer to him as?

So and I have been together for 3 1/2 years, tomorrow we're going to make a joint savings account so we can start saving to get some acres and build in a couple of years. I feel like if I refer to him as my boyfriend, it will sound like we're still children lol. We're not engaged or anything yet, we talked about this over and over for awhile now so we're getting married some day just not right now. Anyway, I don't want to be at the bank saying my boyfriend my boyfriend because, I don't know lol its just going to feel weird. What can I refer to him as?