Your last sentence says a lot -'it is a way for me to cope with her absence'. You're still grieving for her and that's totally understandable given how important she clearly was to you and knowing how deeply she understood you. Nearly two years isn't actually that long when it comes to losing someone who mattered so much. As you say, looking at the photos helps you to hold onto her but sounds like you want to move on and it's preventing you from doing that?

I'm assuming that going back to see her isn't an option or you don't feel you need therapy now? Looking at the photos and having the fantasies show how important she still is and maybe over time as the grief becomes easier to deal with the need to look and to fantasise will get less bothersome. If they don't, it might be worth considering how you can use these very deep feelings and implement them in your life now. You fantasise about going on a date - could you start meeting people if you're not already in a relationship? Could you use the love you feel for her and work on caring for yourself and making a future for yourself? If you can distract yourself by focusing on other things the need to look at the photos may become less problematic.

I hope things start to feel easier very soon.