Set rules! All the rules needed to feel safe. Don't want your partner to have sex with someone without you? Make it a rule! Want all parties to wear condoms? Make it a rule! Hook up can't sleep in your bed? Make it a rule. Seriously, before you do anything have a VERY honest and in depth conversation around jealousy and security. Check out the book Ethical Sluts if you need help with guiding the conversation.
This really helped. Thanks a lot! ;) trying find a guy going be harder Lmfao