What does it mean when at moments I almost call my boyfriend by my ex's name?

xxuxxi
I really like my boyfriend: we have more compatible personalities, similar tastes/hobbies, and he's much nicer with me then my ex was (and in life, I don't mentally compare situations with my ex anymore). HOWEVER sometimes I almost call my Boyfriend by my ex's name: let out the 1st syllable, and mask it with some other word... its very embarrassing for me, but I haven't been caught yet :p. Why would I associate my Ex to my Boyfriend like that? I was with my Ex for 4 years almost and we broke up 8 months ago, and I've been with Boyfriend now for 3 months: does it mean my Boyfriend could be only rebound guy or I'm not over my Ex actually? Is it common to do this and what is the signification to this!?
What does it mean when at moments I almost call my boyfriend by my ex's name?
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