<human>: Can you summarize the given text in a few sentences?

I [23F] have been dating my boyfriend [23M] for about a year now and we have been living together for about 3 or 4 months. Everything has been going very well, our relationship is great. My family loves him and his family (that I have met so far) love me. He's the sweetest, kindest man that I have ever dated and he is incredibly respectful. We rarely ever argue. We split all of our costs and responsibilities down the middle and we are typically very open about everything in our lives.

The only issue I have been having currently is that just a month before we had met he had gotten out of a 4 year relationship with his previous girlfriend. (They broke up and he moved from Canada to the States) We didn't start dating right away, maybe a month or so after we met. Although, for whatever reason its been bothering me lately. I've had a couple of long term relationships before both lasting for roughly 3 years. One thing I have noticed is that after a long term relationship you need time to mourn the relationship and move on. Whether you were the person who ended the relationship or not I think it is healthy to take some time to detach from the relationship and from your previous significant other before getting into another relationship. I don't like the idea of moving from one relationship to the other without giving your self some time. Personally, I think its a bit difficult when you have been doing all of these things with one person and then a month later be doing those things with an entirely different person. It doesn't seem like a month is enough time to let go and differentiate between both people.

I'm only saying this because its been a year, and the other day I mentioned her and he responded with "my girlfriend?" And I know he isn't still in love with her or anything, I just feel like it hasn't been long enough for him to disassociate the term girlfriend with his ex. And if that is the case, what other activities do we do together that he hasn't been able to disassociate with her?

Am I crazy for feeling this way? We've talked about it. But I can't shake the fear of being a rebound.
<bot>: Boyfriend jumped into a relationship with me after being broken up with his ex girlfriend of four years for only a couple of months. It's been about a year and he still accidentally called her his girlfriend.