Actually, differences are important in a relationship.If there are few of them, both will be bored with one another.
Speaking of other women, he is not like Scorpio; love to him doesn't exclude flirting up a storm with the ladies.
If you see him do it and you will blow your top in a dramatic manner, instead of this teaching him to not flirt, he will start to think that maybe you aren't so right for him.
But that happens, and then there is quite a ride, however long it will be.
Compatibility with other Star Signs depends on much more than similarities.
In love and relationships, Sagittarius is the most difficult one to catch.
Sagittarians cherish independence more than anything else, so they don’t jump to any commitments if not overwhelmingly in love.
An immature Sagittarius man may prove too much for you and if it be so, you could do better for your sanity to leave it as friends with this man.
If however, he is the more mature type you may have a chance.
He is of a dissimilar nature from you, but there are many times when things will feel good in your relationship.