I don't think so, but some religions, such as Catholicism, consider sodomy to be immoral.
tell him your pregnant
Assuming that the guy in question is already dating you, then the short answer is because he is too immature to commit to one person.
Yes, or he just wants sex.
There are several factors that can make a guy want to commit to monogamy. These may include finding a compatible partner, emotional connection and trust, shared values and goals, and a desire for stability and intimacy. Additionally, personal readiness, maturity, and a satisfied and fulfilling relationship can also contribute to a guy's willingness to commit. Ultimately, the decision to commit to monogamy varies from person to person.
"Commitment phobic" seems like another of those pseudo-psychology terms that just means that the guy wants to be able to "cat around" whenever he wants. If a guy can't commit, move on. Some guys will never commit unless they see a need. If you tell him that you need more and that you're planning to date other people, he might actually come around. If not, don't bluff, follow through and dump him. It's tough, but why wait for someone who may never commit?
He is not ready for a monogomous relationship (dating 1 person only)
No.
then the guy will tell the girl yes he has heard of another guy...
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If he holds you tight then he likes you. That is not the same as him willing to commit himself to you.
That depends on the guy. Some are jealous, some are not.
Of course you can.