That is a hard situation :( The best advice I can offer is to talk to her about how you feel. Tell her you’re sorry you have been a little unattentive to her feelings towards her boyfriend lately, but you have found it hard after what has happened to you recently. Explain that you’re happy for her but have found it hard to cope lately. I’m sure she will understand and be more sensitive to your feelings. It will get easier with time, I promise. And I’m sure someone is right around the corner that you will want to vent to her about! Goodluck :)