Welcome!To be blunt,it sounds like he cares more for his mother.
When you have a SO,they should come 1st,& his mother should
realise that.It sounds to me,like he should grow up.Also,if he is NOT on a medication,I have never known a young man,that wasn't horny,most of the time.Granted,some more then others,
but most of the time! Irish
P.S.Have you ever heard the term "Mommas boy"?

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Irish---Better to be dead & cool,then alive & uncool!
(Harley Davidson & the Marlboro Man)