It does not sound like you feel valued or important to him.
And if you regularly feel this way, you may have to face the possibility that there is truth in your feelings.
Chances are, when you two are apart, he is enjoying phone or face time with his other options.
In a good relationship, when you are out of sight, you are not out of mind.
A person who is not sure if they have found “the right one” tends to keep their options open in hopes of finding someone more ideal for them.
Though being willing to do anything for is a loving thing to do, he must show himself deserving of this level of affection.
A guy who won’t even be exclusive with you is not deserving of this kind of self-sacrifice.
When it comes to his family, fitting in well is definitely a plus.
Whether he is exploring his options or is not in the mind-frame of a serious relationship, neither scenario is a good position to be in, and you would be well-advised to move on.
Additionally, if he is seeing other people, then you should see other people, too.