Hi there,
I think one way that you will be able to preserve your relationships is to just be happy for your friends. If your friends boyfriends haven’t done anything wrong to you or to your friend then you don’t really have a reason to have this unnecessary hatred towards them. For the sake of your friendships it’s in your best interest to just accept the fact that your friends are in relationships and these men are going to be apart of their lives whether it bothers you or not.
Having hatred towards people also is not healthy for your well being either because negative thoughts create negative situations.
Hatred can drain you of all your energy and peace of mind. Having hatred towards others doesn’t benefit anyone.
It’s okay to feel insecure or or even jealous sometimes, it’s human nature. I find that people only feel strongly about something if that’s what they actually want. Perhaps, you want to be in a relationship which is completely normal too, everyone is looking for love. Just try to focus on yourself, do things that make you feel confident, do things that make you feel happy, enjoy being single and have fun with your friends. As long as you are happy and accepting then your friendships will be perfectly fine.
I hope this helps. Good luck with everything. Hope you have a super awesome day. 🙂